The diagnostic accuracy of the patient health questionnaire-2 (PHQ-2), patient health questionnaire-8 (PHQ-8), and patient health questionnaire-9 (PHQ-9) for detecting major depression: Protocol for a systematic review and individual patient data meta-analyses

Brett D. Thombs, Andrea Benedetti, Lorie A. Kloda, Brooke Levis, Ioana Nicolau, Pim Cuijpers, Simon Gilbody, John P.A. Ioannidis, Dean McMillan, Scott B. Patten, Ian Shrier, Russell J. Steele, Roy C. Ziegelstein

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