6Beard W.Standing urogenital surgery.Vet Clin North Am Equine Pract.1991, 7(3):669-684
7Rosen NG,Hong AR,Soffer SZ,et al.Rectovaginal fistula:a common diagnostic error with significant consequences in girls with anorectal malformations.J Pediatr Surg, 2002,37(7):961-965