RT Journal Article SR Electronic T1 Searching for El Dorado: the impossibility of finding the right rate JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 880 OP 881 VO 167 IS 8 A1 Norman Frohlich A1 Noralou P. Roos YR 2002 UL http://www.cmaj.ca/content/167/8/880.abstract