Journal of Clinical Epidemiology
Journal of Clinical Epidemiology > 2007 > 60 > 4 > 330-335
Journal of Clinical Epidemiology > 2007 > 60 > 9 > 947-953
Journal of Clinical Epidemiology > 2007 > 60 > 10 > 1046-1051
Journal of Clinical Epidemiology > 2007 > 60 > 10 > 1052-1059