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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 10, 2011

WebMD Medical Reference from Healthwise

Last Updated: March 10, 2011
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