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  1. Persistent depressive disorder - Symptoms and causes

  2. Chronic Depression (Dysthymia): Symptoms, Treatments, and …

  3. Chronic Depression: Symptoms, Causes, and Treatment

  4. What Is Chronic Depression? - Psych Central

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

  6. What is chronic depression? Symptoms, causes, and treatment

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

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

  9. Persistent Depressive Disorder - StatPearls - NCBI Bookshelf

  10. Persistent depressive disorder - Diagnosis and treatment - Mayo …