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Source: PHQ-9 copyright 2005, Pfizer, permission granted. The PHQ-9 assessment is adapted from PRIME MD TODAY and developed by RL Spitzer, JBW Williams, K Kroenke, et al.
| By | Healthwise Staff |
| Primary Medical Reviewer | Kathleen Romito, MD - Family Medicine |
| Specialist Medical Reviewer | Lisa S. Weinstock, MD - Psychiatry |
| Last Revised | March 18, 2011 |