RT Journal Article SR Electronic T1 Measuring the presence of chronic diseases JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 500 OP 500-d DO 10.1503/cmaj.1050236 VO 174 IS 4 A1 Wenbin Liang YR 2006 UL http://www.cmaj.ca/content/174/4/500.5.abstract