Non-inferiority of short-term urethral catheterization following fistula repair surgery: study protocol for a randomized controlled trial oleh Barone Mark A, Frajzyngier Vera, Arrowsmith Steven, Ruminjo Joseph, Seuc Armando, Landry Evelyn, Beattie Karen, Barry Thierno, Lewis Alyona, Muleta Mulu, Nembunzu Dolorès, Olupot Robert, Sunday-Adeoye Ileogben, Wakasiaka Weston, Widmer Mariana, Gülmezoglu A Metin