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  1. Depression (major depressive disorder) - Symptoms and causes

  2. Causes of Depression: Genetics, Illness, Abuse, and More - WebMD

  3. Depression: Causes, Symptoms, Types & Treatment - Cleveland Clinic

  4. What causes depression? - Harvard Health

  5. Depression: What It Is, Symptoms, Causes, Treatment, and More - Healthline

  6. Causes of Depression | Psychology Today

  7. Depressive disorder (depression) - World Health Organization

  8. Depression - National Institute of Mental Health (NIMH)

  9. Depression - National Institute of Mental Health (NIMH)

  10. We looked at genetic clues to depression in more than 14,000 …