1. Congenital malformations. A report of a study of series of consecutive births in 24 centres;Stevenson;Bull World Health Organ,1966
2. Study of the incidence of hypospadias in Rochester, Minnesota, 1940–1970, and a case-control comparison of possible etiologic factors;Sweet;Mayo Clin Proc,1974
3. The incidence of hypospadias in Sweden;Avellan;Scand J Plast Reconstr Surg,1975
4. Increased birth prevalence of isolated hypospadias in Hungary;Czeizel;Acta Paediatr Hung,1986
5. Hypospadias trends in two US surveillance systems;Paulozzi;Pediatrics,1997