Transperineal Sonography of the Anal Sphincter Complex in Neonates and Infants: Differentiation of Anteriorly Displaced Anus from Low-Type Imperforate Anus with Perineal Fistula - Haber, H P; Warmann, S W; Fuchs, J (Ultraschall in der Medizin - European Journal of Ultrasound, 2008)