1. The Centers for Disease Control and Prevention, Division of Laboratory Sciences. Quality assurance and proficiency testing for newborn screening. Available at: http://www.cdc.gov/nceh/dls/newborn.htm. Accessed December 17, 2009.
2. National Center for Hearing Assessment & Management, Early Hearing Detection and Intervention/Universal Newborn Hearing Screening. Available at: www.infanthearing.org/resources.html. Accessed December 17, 2009.