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The 'help' question doesn't help when screening for major depression: external validation of the three-question screening test for primary care patients managed for physical complaints

Patrick Lombardo, Paul Vaucher, Nader Haftgoli, Bernard Burnand, Bernard Favrat, François Verdon, Thomas Bischoff and Lilli Herzig*

BMC Medicine 2011, 9:114  doi:10.1186/1741-7015-9-114

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