1. Cancer in Nor;Chen,2000
2. EUROCAT Working Group. 1999. EUROCAT Report 7A. Prevalence of congenital anomalies in Europe 1995-6: update to EUROCAT Report 7(www.lshtm.ac.uk/php/eeu/eurocat/eurocat.htm).
3. International Clearinghouse for Birth Defects Monitoring Systems. 1991. Congenital malformations worldwide. New York: Elsevier Science: p 35-40.
4. 2000. Genetic susceptibility to birth defects in humans: from gene discovery to public health action. Teratology. 61: 17-20.