Search results
Journal of Clinical Epidemiology > 2008 > 61 > 4 > 386.e1-386.e9
Primary Care Respiratory Journal > 2006 > 15 > 1 > 58-70
Primary Care Respiratory Journal > 2006 > 15 > 1 > 48-57
Primary Care Respiratory Journal > 2006 > 15 > 1 > 35-47