Journal of Clinical Epidemiology
Journal of Clinical Epidemiology > 2007 > 60 > 12 > 1220-1225
Journal of Clinical Epidemiology > 2007 > 60 > 12 > 1205-1219
Journal of Clinical Epidemiology > 2007 > 60 > 12 > 1220-1225
Journal of Clinical Epidemiology > 2007 > 60 > 12 > 1205-1219