Equivalency of the diagnostic accuracy of the PHQ-8 and PHQ-9: a systematic review and individual participant data meta-analysis.
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Psychol Med. 2020 Jun;50(8):1368-1380. doi: 10.1017/S0033291719001314. Epub 2019 Jul 12.
Psychol Med. 2020.
PMID: 31298180
Free PMC article.
