Centers for Disease Control and Prevention. Newborn screening. http://www.cdc.gov/ncbddd/newbornscreening/ Updated February 23, 2016. Accessed April 5, 2016.
Centers for Disease Control and Prevention. National Center on Birth Defects and Developmental Disabilities. Screening for critical congenital heart defects. http://www.cdc.gov/ncbddd/pediatricgenetics/documents/CCHD-factsheet.pdf. Accessed April 5, 2016.