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

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

  3. Depressive disorder (depression) - World Health Organization

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

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

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

  7. Psychiatry.org - What Is Depression?

  8. All About Depression: Symptoms, Types, and Treatments - Psych Central

  9. Depression (major depressive disorder) - Mayo Clinic

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