1. Zollman C, Vickers A. ABC of complementary medicine: what is complementary medicine? BMJ. 1999;319(7211):693–6.
2. National Center for Complementary and Alternative Medicine (NCCAM). Complementary, alternative, or integrative health [Internet]. 2013 [cited 2014 Jan 15]. Available at: http://nccam.nih.gov/health/whatiscam .
3. Surette S, Vanderjagt L, Vohra S. Surveys of complementary and alternative medicine usage: a scoping study of the paediatric literature. Complement Ther Med. 2013;21 Suppl 1:S48–53.
4. Consumer Health Products Canada (CHPC). What is a natural health product? [Internet]. 2012 [cited 2014 Feb 2]. Available at: http://www.chpcanada.ca/en/industry-products/faqs/natural-health-products .
5. National Center for Complementary and Alternative Medicine (NCCAM). Traditional Chinese medicine: an introduction [Internet]. 2013 [cited 2014 Jan 15]. Available at: http://nccam.nih.gov/health/whatiscam/chinesemed.htm .