passages.id: split_8_test_844_passage
passages.type: progene_text
passages.text: The study involved a prospective series of 48 male patients ( 32 HIV - seropositive and 16 with acquired immunodeficiency syndrome ) who underwent hemorrhoidectomy between 1992 and 1996 ; 20 age - matched and gender - matched seronegative patients were retrospectively identified as controls .