RT Journal Article SR Electronic T1 Extrapelvic endometriosis associated with occult groin hernias JF Canadian Journal of Surgery JO CAN J SURG FD Canadian Medical Association SP 224 OP 224 VO 44 IS 3 A1 Ugo Boggi A1 Marco Del Chiaro A1 Andrea Pietrabissa A1 Franco Mosca YR 2001 UL http://canjsurg.ca/content/44/3/224.1.abstract