1. National Center for Complementary and Alternative Medicine. What is complementary and alternative medicine? (Publication D347). 〈http://nccam.nih.gov/health/whatiscam〉; Published 2012 Accessed September 30, 2016.
2. Complementary and alternative medicine use among adults: United States, 2002;Barnes;Adv Data,2004
3. Trends in the use of complementary health approaches among adults: United States, 2002–2012;Clarke;Natl Health Stat Rep,2015
4. Costs of complementary and alternative medicine (CAM) and frequency of visits to CAM practitioners: United States, 2007;Nahin;Natl Health Stat Rep,2009
5. Consumer Healthcare Products Association. Statistics on OTC Use. 〈http://www.chpa.org/marketstats.aspx〉; Published 2016 Accessed September 30, 2016.