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Depression (major depressive disorder) - Symptoms and causes
Major depressive disorder - Wikipedia
Major Depressive Disorder - StatPearls - NCBI Bookshelf
Clinical Depression (Major Depressive Disorder) - Cleveland Clinic
Depression (major depressive disorder) - Mayo Clinic
Depression - National Institute of Mental Health (NIMH)
Major Depressive Disorder: Symptoms, Causes, and Treatment
Psychiatry.org - What Is Depression?
Depression - National Institute of Mental Health (NIMH)
Major Depression - National Institute of Mental Health (NIMH)