1. Dietary supplement use among infants, children, and adolescents in the United States, 1999–2002;Picciano;Arch Pediatr Adolesc Med,2007
2. Dietary supplement use among U.S. adults has increased since NHANES III (1988–1994);Gahche;NCHS Data Brief,2011
3. Complementary and alternative medicine use among adults and children: United States, 2007;Barnes,2008
4. National Center for Health Statistics. National Health Interview Survey (NHIS): 2007 data release. 2007. Available from: http://www.cdc.gov/nchs/nhis/nhis_2007_data_release.htm (cited 20 August 2012).
5. National Center for Health Statistics. National Health Interview Survey (NHIS): public-use data release. NHIS survey description 2008. Available from: ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Dataset-Documentation/NHIS/2007/srvydesc.pdf (cited 20 August 2012)