"What is the NHIN?"(PDF). U.S. Department of Health and Human Services. 23 July 2009. Archived from the original(PDF) on June 3, 2010. Retrieved September 28, 2009.
"What is the NHIN?"(PDF). U.S. Department of Health and Human Services. 23 July 2009. Archived from the original(PDF) on June 3, 2010. Retrieved September 28, 2009.