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

  2. Depressive disorder (depression) - World Health Organization

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

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

  5. Depression: What it is, symptoms, causes, treatment, and more

  6. Psychiatry.org - What Is Depression?

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

  8. Depression (major depressive disorder) - Mayo Clinic

  9. Depression - World Health Organization (WHO)

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