1. Ingram , T. T. S. 1970 Personal communication
2. Spina bifida in Birmingham;Knox;Develop. Med. Child Neurol.,1967
3. The survival of untreated spina bifida cystica;Laurence;Develop. Med. Child Neurol.,1966
4. Laurence , K. M. 1970 Personal communication
5. Follow-up of 65 survivors from 425 cases of spina bifida born in South Wales between 1956 and 1962;Laurence;Develop. Med. Child Neurol.,1967