RT Journal Article SR Electronic T1 Omphalocele affecting both members of a twin pregnancy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 374 OP 376 VO 99 IS 8 A1 A. A. Yuzpe A1 H. D. Johnson YR 1968 UL http://www.cmaj.ca/content/99/8/374.abstract