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

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

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

  4. Depressive disorder (depression) - World Health Organization …

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

  6. Depression (major depressive disorder) - Mayo Clinic

  7. Psychiatry.org - What Is Depression?

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

  9. What Is Depression? Symptoms, Causes, Diagnosis, Treatment, …

  10. All About Depression: Symptoms, Types, and Treatments - Psych …