National Society of Genetic Counselors401 N. Michigan AvenueChicago, IL 60611(312) 321-6834E-mail: nsgc@nsgc.orgNational Center for Education on Maternal and Child HealthP.O. Box 571272Washington, DC 20057(202) 784-9770E-mail: mchlibrary@ncemch.orgNational Dissemination Center for Children with Disabilities P.O. Box 1492Washington, D.C. 20013(800) 695-0285E-mail: nichcy@aed.orgNational Organization for Rare Disorders (NORD)P.O. Box 1968Danbury, CT 06813(800) 999-6673(203) 744-0100E-mail: RN@rarediseases.orgAugust 2007