1Department of Epidemiology and Prevention, Division of Public Health Sciences, Wake Forest University School of Medicine , Winston-Salem, NC 27157-1063, USA. [email protected] 2University of Calgary, calgary, Alberta, canada
3Wake Forest University School of Medicine, Winston-Salem, NC
4University of Southampton, Southampton,United Kingdom
5Norwegian University of Science and Technology, Trondheim, Norway
6National Research Center in Complementary and Alternative Medicine (NAFKAM), University of Tromsø, Tromsø, Norway.
7General Internal Medicine
8Mayo Clinic, Rochester, MN