Journal of Clinical Epidemiology
Journal of Clinical Epidemiology > 2012 > 65 > 3 > 335-342
Journal of Clinical Epidemiology > 2012 > 65 > 4 > 404-412
Journal of Clinical Epidemiology > 2012 > 65 > 3 > 335-342
Journal of Clinical Epidemiology > 2012 > 65 > 4 > 404-412