Journal of Clinical Epidemiology
Journal of Clinical Epidemiology > 2012 > 65 > 8 > 870-876
Journal of Clinical Epidemiology > 2012 > 65 > 12 > 1282-1288
Journal of Clinical Epidemiology > 2012 > 65 > 8 > 870-876
Journal of Clinical Epidemiology > 2012 > 65 > 12 > 1282-1288