Kroenke, K., Spitzer, R.L., & Williams, J.B. (2001). The PHQ-9: Validity of a brief depression screening measure. Journal of General Internal Medicine, 16, 606-613.

Kroenke, K., Spitzer, R.L., & Williams, J.B. (2001).  The PHQ-9: Validity of a brief depression screening measure.  Journal of General Internal Medicine, 16, 606-613.

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