RT Journal Article SR Electronic T1 Measuring birth defects and handicapping disorders in the population: the British Columbia Health Surveillance Registry JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 109 OP 111 VO 136 IS 2 A1 Baird, P. A. YR 1987 UL http://www.cmaj.ca/content/136/2/109.abstract