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

  2. Warning Signs of Severe Depression - WebMD

  3. What Are the Signs That You Are Severely Depressed? - Verywell …

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

  5. Depression (major depressive disorder) - Diagnosis and treatment …

  6. Major depressive disorder - Wikipedia

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

  8. Depressive disorder (depression) - World Health Organization

  9. Major Depression | Johns Hopkins Medicine

  10. Major Depression (Clinical Depression) - WebMD