RT Journal Article SR Electronic T1 Obturator hernia JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E50 OP E50 DO 10.1503/cmaj.211095 VO 194 IS 2 A1 Hiroaki Nakagawa A1 Tsukasa Asakura A1 Sugihiro Hamaguchi YR 2022 UL http://www.cmaj.ca/content/194/2/E50.abstract