RT Journal Article SR Electronic T1 Morbidity in assistants at surgical operations JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 632 OP 633 VO 110 IS 6 A1 Laerum, O. D. A1 Skullerud, K. YR 1974 UL http://www.cmaj.ca/content/110/6/632.abstract