Journal of Clinical Epidemiology
Journal of Clinical Epidemiology > 2012 > 65 > 3 > 247-252
Journal of Clinical Epidemiology > 2012 > 65 > 7 > 725-733
Journal of Clinical Epidemiology > 2012 > 65 > 3 > 247-252
Journal of Clinical Epidemiology > 2012 > 65 > 7 > 725-733