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

  2. Depressive disorder (depression) - World Health Organization

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

  4. Psychiatry.org - What Is Depression?

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

  6. Μείζων καταθλιπτική διαταραχή - Βικιπαίδεια

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

  8. Depression - NHS

  9. Depression (major depressive disorder) - Mayo Clinic

  10. Depression - Mind