1. Health-related quality of life—United States, 2006 and 2010;MM Zack;Morbidity and mortality weekly report Surveillance summaries (Washington, D C: 2002),2013
2. Barnes PM, Bloom B, Nahin RL (2008) Complementary and alternative medicine use among adults and children: United States, 2007. National health statistics reports 1–23.
3. Higgins JPT, Green S (2011) Cochrane Handbook for Systematic Reviews of Interventions Version 5.1.0 [updated March 2011].
4. What is meta-analysis?;A Shorten;Evid Based Nurs,2013
5. Methodology in conducting a systematic review of systematic reviews of healthcare interventions;V Smith;BMC Med Res Methodol,2011