1. Congenital anomalies of the anus and rectum;Woolam,1964
2. Familial incidence of congenital anorectal anomalies;Cozzi;Surgery,1968
3. Imperforate anus in identical twins;Feggetter;Newcastle Med J,1939
4. Anorectal abnormalities as a congenital familial incidence;Kaijser;Acta Paediat,1957
5. Familial anus vestibularies;Seitz;Zbl Gynaek,1951