RT Journal Article SR Electronic T1 The Pocket Guide to Critical Appraisal: A Handbook for Health Care Professionals JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 448 OP 448 VO 157 IS 4 A1 B. J. Harvey YR 1997 UL http://www.cmaj.ca/content/157/4/448.1.abstract AB