RT Journal Article SR Electronic T1 Communications research JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1064 OP 1065 VO 153 IS 8 A1 V. Entwistle A1 I. Watt A1 H. Buchan YR 1995 UL http://www.cmaj.ca/content/153/8/1064.abstract