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Best Practice & Research Clinical Endocrinology & Metabolism > 2008 > 22 > 5 > 787-812
Journal of Clinical Epidemiology > 1997 > 50 > 5 > 589-594
Best Practice & Research Clinical Endocrinology & Metabolism > 2008 > 22 > 5 > 787-812
Journal of Clinical Epidemiology > 1997 > 50 > 5 > 589-594