Journal of Clinical Epidemiology
Journal of Clinical Epidemiology > 2007 > 60 > 3 > 288-293
Journal of Clinical Epidemiology > 2007 > 60 > 9 > 954-962
Journal of Clinical Epidemiology > 2007 > 60 > 3 > 288-293
Journal of Clinical Epidemiology > 2007 > 60 > 9 > 954-962