All Stories

  1. Development, system design, safety, and performance metrics of a conversational agent for reducing depressive and anxious symptoms based on a large language model: The MHAI study

    Article • PLOS One, March 2026, PLOS

    BSc. MPH. David Villarreal-Zegarra

  2. Evaluation of usability and acceptability of a Peruvian telemental health service for early assessment among vulnerable occupational workers: Mixed-method study with a user-centered design approach

    Article • PLOS One, February 2026, PLOS

    BSc. MPH. David Villarreal-Zegarra

  3. Generation of Synthetic Data in Health Surveys Using Large Language Models

    Article • January 2026, openRxiv

    BSc. MPH. David Villarreal-Zegarra

  4. Ethical and Regulatory Gaps in Using Generative AI for Mental Health Support in Low- and Middle-Income Countries

    Article • Interacciones Revista de Avances en Psicología, January 2026, Instituto Peruano de Orientacion Psicologica - IPOPS

    BSc. MPH. David Villarreal-Zegarra

  5. Correction: Effectiveness, Usability, and Satisfaction of a Self-Administered Digital Intervention for Reducing Depression, Anxiety, and Stress in a University Community in the Andean Region of Peru: Randomized Controlled Trial

    Article • JMIR Formative Research, December 2025, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  6. Spanish version of the Posttraumatic Stress Disorder Checklist for DSM-5 (PCL-5) in health workers

    Article • International Journal of Mental Health, October 2025, Taylor & Francis

    BSc. MPH. David Villarreal-Zegarra

  7. Development, System Design, Safety, and Performance Metrics of a Conversational Agent for Reducing Depressive and Anxious Symptoms Based on a Large Language Model: The MHAI Study

    Article • September 2025, Cold Spring Harbor Laboratory Press

    BSc. MPH. David Villarreal-Zegarra

  8. Profiles of inpatient psychiatry referrals: A 4-year analysis in a Consultation-Liaison Psychiatry Service

    Article • June 2025, Cold Spring Harbor Laboratory Press

    BSc. MPH. David Villarreal-Zegarra

  9. Assessment of GPT-Based Conversational Agents Aimed to Reduce Healthcare Provider Stigma

    Article • June 2025, IOS Press

    BSc. MPH. David Villarreal-Zegarra

  10. Fluctuations in Daily Happiness and Nervousness Based on Depressive and Anxious Symptoms in Adolescents or Young Adults Across 3 Latin American Cities: Experience Sampling Study

    Article • JMIR Formative Research, June 2025, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  11. Spanish-version of the Posttraumatic Stress Disorder Checklist for DSM-5 (PCL-5) in health-workers

    Article • June 2025, Cold Spring Harbor Laboratory Press

    BSc. MPH. David Villarreal-Zegarra

  12. Psychometric properties of the patient health questionnaire-8 and general anxiety disorder-7 in adolescents and young adults from three Latin American cities: Internal structure, invariance, internal consistency and divergent validity

    Article • Journal of Affective Disorders, June 2025, Elsevier

    BSc. MPH. David Villarreal-Zegarra

  13. Costs and cost-effectiveness of interventions based on third generation therapy models to treat symptoms of depression and anxiety: A systematic review and meta-analysis

    Article • May 2025, Cold Spring Harbor Laboratory Press

    BSc. MPH. David Villarreal-Zegarra

  14. Prevalence and Associated Factors of Mental Health Outcomes in Peruvian Healthcare Workers During the COVID-19 Pandemic: The FRONTLINE Study

    Article • Hispanic Health Care International, March 2025, SAGE Publications

    BSc. MPH. David Villarreal-Zegarra

  15. Effectiveness, Usability and Satisfaction of a Self-Administered Digital Intervention for Reducing Depression, Anxiety and Stress in a University Community in the Andean Region of Peru: A Randomized Clinical Trial (Preprint)

    Article • January 2025, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  16. Effectiveness, Usability and Satisfaction of a Self-Administered Digital Intervention for Reducing Depression, Anxiety and Stress in a University Community in the Andean Region of Peru: A Randomized Controlled Trial (Preprint)

    Article • JMIR Formative Research, January 2025, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  17. Human resources and healthcare infrastructure in Peru: A cross-sectional analysis from 2018 to 2024

    Article • January 2025, Cold Spring Harbor Laboratory Press

    BSc. MPH. David Villarreal-Zegarra

  18. Validez de estructura interna de la escala de valoración de la atención primaria en establecimientos de salud peruanos

    Article • ACTA MEDICA PERUANA, December 2024, Colegio Medico del Peru

    BSc. MPH. David Villarreal-Zegarra

  19. Does daily happiness and nervousness differ in adolescents and young adults in three Latin American cities: an experience sampling study (Preprint)

    Article • August 2024, JMIR Publications Inc.

    Dr Nicola Jane Holt, BSc. MPH. David Villarreal-Zegarra

  20. Self-Administered Interventions Based on Natural Language Processing Models for Reducing Depressive and Anxiety Symptoms: Systematic Review and Meta-Analysis

    Article • JMIR Mental Health, August 2024, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  21. Cost-sharing and associated factors in the Peruvian private health care system

    Article • PLOS One, August 2024, PLOS

    BSc. MPH. David Villarreal-Zegarra

  22. In-Person and Teleconsultation Services at a National Hospital in Peru: Time Series Analysis of General and Psychiatric Care Amid the COVID-19 Pandemic

    Article • JMIR Mental Health, July 2024, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  23. Telehealth in community mental health centers during the COVID-19 pandemic in Peru: A qualitative study with key stakeholders

    Article • SSM - Mental Health, June 2024, Elsevier

    BSc. MPH. David Villarreal-Zegarra

  24. Evaluation of usability and acceptability of Telemental health service among vulnerable occupational workers: A formative study based on user-centered design (Preprint)

    Article • May 2024, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  25. Evaluation of usability and acceptability of a peruvian Telemental health service for early assessment among vulnerable occupational workers: mixed-method study with a user-centered design approach (Preprint)

    Article • JMIR Formative Research, May 2024, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  26. Prevalence and factors associated with burnout syndrome in Peruvian health professionals before the COVID-19 pandemic: A systematic review

    Article • Heliyon, May 2024, Elsevier

    BSc. MPH. David Villarreal-Zegarra

  27. Immersive Technologies for Depression Care: Scoping Review

    Article • JMIR Mental Health, April 2024, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  28. Self-administered interventions based on natural language processing models for reducing depressive and anxious symptoms: Systematic review and meta-analysis (Preprint)

    Article • April 2024, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  29. Psychometric properties of the GAD-7 (General Anxiety Disorder-7): a cross-sectional study of the Peruvian general population

    Article • BMC Psychology, April 2024, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  30. Impact of the COVID-19 pandemic on the services provided by the Peruvian health system: an analysis of people with chronic diseases

    Article • Scientific Reports, February 2024, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  31. Immersive Technologies for Depression Care: Scoping Review (Preprint)

    Article • January 2024, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  32. Perception of personal protective equipment availability and mental health outcomes in workers from two national hospitals during the COVID-19 pandemic

    Article • Heliyon, January 2024, Elsevier

    BSc. MPH. David Villarreal-Zegarra

  33. Association between abdominal obesity and depressive symptoms in Peruvian women aged 18–49 years: a sub-analysis of the Demographic and Family Health Survey 2018–2019

    Article • Public Health Nutrition, January 2024, Cambridge University Press

    BSc. MPH. David Villarreal-Zegarra

  34. Differences in family functioning before and during the COVID-19 pandemic: an observational study in Peruvian families

    Article • PeerJ, December 2023, PeerJ

    BSc. MPH. David Villarreal-Zegarra

  35. Socio-demographic, migratory and health-related determinants of food insecurity among Venezuelan migrants in Peru

    Article • Public Health Nutrition, November 2023, Cambridge University Press

    BSc. MPH. David Villarreal-Zegarra

  36. Paper promises: Peruvian frontline health workers’ perspectives on mental health policies during COVID-19

    Article • Health Policy and Planning, November 2023, Oxford University Press (OUP)

    BSc. MPH. David Villarreal-Zegarra

  37. In-Person and Teleconsultation Services at a National Hospital in Peru: Time Series Analysis of General and Psychiatric Care Amid the COVID-19 Pandemic (Preprint)

    Article • October 2023, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  38. Measurement scales of mental health related to climate change: a scoping review protocol using artificial intelligence

    Article • BMJ Open, October 2023, BMJ

    BSc. MPH. David Villarreal-Zegarra

  39. Experiencias de usuarios y familiares sobre la atención recibida en centros de salud mental comunitaria de Lima y Callao durante la pandemia de la COVID-19

    Article • Revista Peruana de Medicina Experimental y Salud Pública, September 2023, Instituto Nacional de Salud (Peru)

    BSc. MPH. David Villarreal-Zegarra

  40. Sensitivity and specificity of the Patient Health Questionnaire (PHQ-9, PHQ-8, PHQ-2) and General Anxiety Disorder scale (GAD-7, GAD-2) for depression and anxiety diagnosis: a cross-sectional study in a Peruvian hospital population

    Article • BMJ Open, September 2023, BMJ

    BSc. MPH. David Villarreal-Zegarra

  41. Provision of community mental health care before and during the COVID-19 pandemic: A time series analysis in Peru

    Article • International Journal of Social Psychiatry, July 2023, SAGE Publications

    BSc. MPH. David Villarreal-Zegarra

  42. Profiles of depressive symptoms in Peru: An 8-year analysis in population-based surveys

    Article • Journal of Affective Disorders, July 2023, Elsevier

    BSc. MPH. David Villarreal-Zegarra

  43. Effects of vaccination against COVID-19 on the emotional health of older adults

    Article • F1000Research, May 2023, Faculty of 1000, Ltd.

    BSc. MPH. David Villarreal-Zegarra

  44. Estimated impact of the COVID-19 pandemic on the prevalence and treatment of depressive symptoms in Peru: an interrupted time series analysis in 2014–2021

    Article • Social Psychiatry and Psychiatric Epidemiology, March 2023, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  45. Characteristics of undergraduate and second speciality mental health programmes in Peru: a cross-sectional study

    Article • Human Resources for Health, March 2023, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  46. Research skills for university students' thesis in E-learning: Scale development and validation in Peru

    Article • Heliyon, March 2023, Elsevier

    BSc. MPH. David Villarreal-Zegarra

  47. Psychopathy traits and their association with depression, anxiety and sociodemographic factors in Peruvian medical students

    Article • Anales de la Facultad de Medicina, February 2023, Universidad Nacional Mayor de San Marcos, Vicerectorado de Investigacion

    BSc. MPH. David Villarreal-Zegarra

  48. The impact of COVID-19 pandemic on the quality of life of healthcare workers and the associated factors: A systematic review

    Article • Revista de Psiquiatría y Salud Mental, January 2023, Elsevier

    BSc. MPH. David Villarreal-Zegarra

  49. An explanatory model of suicidal ideation based on family functionality and mental health problems: A cross-sectional study of medical students

    Article • Interacciones Revista de Avances en Psicología, December 2022, Instituto Peruano de Orientacion Psicologica - IPOPS

    BSc. MPH. David Villarreal-Zegarra

  50. Personality profiles and engagement with the augmented reality game Pokémon GO: a cross-sectional study

    Article • Wellcome Open Research, October 2022, Faculty of 1000, Ltd.

    BSc. MPH. David Villarreal-Zegarra

  51. An explanatory model of depressive symptoms from anxiety, post-traumatic stress, somatic symptoms, and symptom perception: the potential role of inflammatory markers in hospitalized COVID-19 patients

    Article • BMC Psychiatry, October 2022, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  52. Relationship between job satisfaction, burnout syndrome and depressive symptoms in physicians: a cross-sectional study based on the employment demand–control model using structural equation modelling

    Article • BMJ Open, October 2022, BMJ

    BSc. MPH. David Villarreal-Zegarra

  53. Effects of vaccination against COVID-19 on the emotional health of older adults

    Article • F1000Research, July 2022, Faculty of 1000, Ltd.

    BSc. MPH. David Villarreal-Zegarra

  54. Policies on mental health in the workplace during the COVID-19 pandemic: A scoping review

    Article • PLOS One, July 2022, PLOS

    BSc. MPH. David Villarreal-Zegarra

  55. Spanish version of Jenkins Sleep Scale in physicians and nurses: psychometric properties from a Peruvian nationally representative sample

    Article • Journal of Psychosomatic Research, June 2022, Elsevier

    BSc. MPH. David Villarreal-Zegarra

  56. Validation of the medium and short version of CENSOPAS-COPSOQ: a psychometric study in the Peruvian population

    Article • BMC Public Health, May 2022, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  57. Factors Associated with Mental Health Outcomes in Hospital Workers during the COVID-19 Pandemic: A Mixed-Methods Study

    Article • International Journal of Environmental Research and Public Health, April 2022, MDPI AG

    BSc. MPH. David Villarreal-Zegarra

  58. Development of a Framework for the Implementation of Synchronous Digital Mental Health: Realist Synthesis of Systematic Reviews

    Article • JMIR Mental Health, March 2022, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  59. Interacciones: Journal of Family, Clinical and Health Psychology

    Article • Interacciones Revista de Avances en Psicología, March 2022, Instituto Peruano de Orientacion Psicologica - IPOPS

    BSc. MPH. David Villarreal-Zegarra

  60. Characteristics of undergraduate, second speciality and sub-speciality mental health programmes in Peru: a scoping review

    Article • February 2022, Research Square

    BSc. MPH. David Villarreal-Zegarra

  61. Effects of vaccination against COVID-19 on the emotional health of Peruvian older adults

    Article • January 2022, Cold Spring Harbor Laboratory Press

    BSc. MPH. David Villarreal-Zegarra

  62. Development of a Framework for the Implementation of Synchronous Digital Mental Health: Realist Synthesis of Systematic Reviews (Preprint)

    Article • November 2021, JMIR Publications Inc.

    BSc. MPH. David Villarreal-Zegarra

  63. Development of the set of scales to assess the job satisfaction among physicians in Peru: validity and reliability assessment

    Article • BMC Public Health, October 2021, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  64. Relationship between Job Satisfaction, Burnout, and Depressive Symptoms in Physicians: A Cross-sectional Study based on the Employment Demand Control Model

    Article • August 2021, Research Square

    BSc. MPH. David Villarreal-Zegarra

  65. Development of a framework for the implementation of synchronous e-mental health: a protocol for a realist synthesis of systematic reviews

    Article • F1000Research, August 2021, Faculty of 1000, Ltd.

    BSc. MPH. David Villarreal-Zegarra

  66. Type 2 diabetes mellitus and antibiotic-resistant infections: a systematic review and meta-analysis

    Article • Journal of Epidemiology & Community Health, July 2021, BMJ

    BSc. MPH. David Villarreal-Zegarra

  67. Secuelas post-COVID en salud mental: una revisión narrativa

    Article • REVISTA MÉDICA VALLEJIANA/ Vallejian Medical Journal, June 2021, Universidad Cesar Vallejo

    BSc. MPH. David Villarreal-Zegarra

  68. Explanatory Model of Perceived Stress in the General Population: A Cross-Sectional Study in Peru During the COVID-19 Context

    Article • Frontiers in Psychology, June 2021, Frontiers

    BSc. MPH. David Villarreal-Zegarra

  69. Validation of the medium and short version of CENSOPAS-COPSOQ: A psychometric study in the Peruvian population

    Article • March 2021, Research Square

    BSc. MPH. David Villarreal-Zegarra

  70. Validity and reliability of Hospital Anxiety and Depression Scale in cancer patients in Peru

    Article • March 2021, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  71. Development of a framework for the implementation of electronic interventions in mental health: a protocol for a meta-synthesis of systematic reviews

    Article • F1000Research, October 2020, Faculty of 1000, Ltd.

    BSc. MPH. David Villarreal-Zegarra

  72. Development a set of scales to assess job satisfaction among physicians in Peru: validity and reliability assessment

    Article • July 2020, FapUNIFESP (SciELO)

    BSc. MPH. David Villarreal-Zegarra

  73. Trends in the prevalence and treatment of depressive symptoms in Peru: a population-based study

    Article • BMJ Open, July 2020, BMJ

    BSc. MPH. David Villarreal-Zegarra

  74. Psychometric Properties of a Spanish Version of the Fear of COVID-19 Scale in General Population of Lima, Peru

    Article • International Journal of Mental Health and Addiction, June 2020, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  75. Short-term trends in the prevalence, awareness, treatment, and control of arterial hypertension in Peru

    Article • Journal of Human Hypertension, June 2020, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  76. Nutritional Quality of Food and Beverages Offered in Supermarkets of Lima According to the Peruvian Law of Healthy Eating

    Article • Nutrients, May 2020, MDPI AG

    BSc. MPH. David Villarreal-Zegarra

  77. Association between arterial hypertension and depressive symptoms: Results from population‐based surveys in Peru

    Article • Asia-Pacific Psychiatry, March 2020, Wiley

    BSc. MPH. David Villarreal-Zegarra

  78. Acupuncture for major depressive disorder: A review of the recommendations stated at clinical practice guidelines

    Article • Complementary Therapies in Medicine, March 2020, Elsevier

    BSc. MPH. David Villarreal-Zegarra

  79. Cancer-related mortality in Peru: Trends from 2003 to 2016

    Article • PLOS One, February 2020, PLOS

    BSc. MPH. David Villarreal-Zegarra

  80. Parents’ Perceptions about Salt Consumption in Urban Areas of Peru: Formative Research for a Social Marketing Strategy

    Article • Nutrients, January 2020, MDPI AG

    BSc. MPH. David Villarreal-Zegarra

  81. Use of unproven treatments in mental health: The case of Bach Flowers

    Article • Revista de la Facultad de Medicina, October 2019, Universidad Nacional de Colombia

    BSc. MPH. David Villarreal-Zegarra

  82. Valid group comparisons can be made with the Patient Health Questionnaire (PHQ-9): A measurement invariance study across groups by demographic characteristics

    Article • PLOS One, September 2019, PLOS

    BSc. MPH. David Villarreal-Zegarra

  83. Validez y confiabilidad de la escala de satisfacción de los usuarios de consulta médica ambulatoria en Perú

    Article • Revista Peruana de Medicina Experimental y Salud Pública, June 2019, Instituto Nacional de Salud (Peru)

    BSc. MPH. David Villarreal-Zegarra

  84. Characteristics and quality of clinical practice guidelines for depression in adults: a scoping review

    Article • BMC Psychiatry, February 2019, Springer Science + Business Media

    BSc. MPH. David Villarreal-Zegarra

  85. ¿Temor de compartir los datos?: La necesidad de una ciencia más abierta

    Article • Interacciones Revista de Avances en Psicología, January 2019, Instituto Peruano de Orientacion Psicologica - IPOPS

    BSc. MPH. David Villarreal-Zegarra

  86. Validez y confiabilidad de la Escala Satisfacción Familiar en estudiantes universitarios de Lima Metropolitana, Perú

    Article • Actualidades en Psicología, November 2017, Universidad de Costa Rica

    BSc. MPH. David Villarreal-Zegarra

  87. Cohesión, adaptabilidad y composición familiar en adolescentes del Callao, Perú

    Article • Propósitos y Representaciones, August 2017, Universidad San Ignacio de Loyola S.A.

    BSc. MPH. David Villarreal-Zegarra

  88. Terapia familiar sistémica: una aproximación a la teoría y la práctica clínica

    Article • Interacciones Revista de Avances en Psicología, November 2015, Instituto Peruano de Orientacion Psicologica - IPOPS

    BSc. MPH. David Villarreal-Zegarra