1. Hospital for Sick Children, Toronto, Cystic Fibrosis Mutation Database. Available at: http://www.genet.sickkids.on.ca/cftr/.
2. American College of Obstetrics and Gynecology, and American college of Hum Genet, Preconception and prenatal carrier screening for Cystic Fibrosis. Clinical and laboratory guidelines. Washington, DC: American College of Obstetrics and Gynecology, 2001.