RT Journal Article SR Electronic T1 Pain in both knees JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1227 OP 1227 DO 10.1503/cmaj.080104 VO 179 IS 11 A1 Wei-Jing Lee MD A1 Antonio Leo T TE MD A1 Yung-Ze Cheng MD YR 2008 UL http://www.cmaj.ca/content/179/11/1227.abstract