1. Department of Internal Medicine, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile;
2. Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada;
3. Department of Internal Medicine, Hospital Alemán, Buenos Aires, Argentina;
4. Department of Medicine, McGill University, Montreal, QC, Canada;
5. Centre for Clinical Epidemiology, Jewish General Hospital/Lady Davis Institute, Montreal, QC, Canada;
6. Department of Medicine, McMaster University, Hamilton, ON, Canada;
7. Department of Internal Medicine, Faculty of Medicine, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil;
8. Department of Medicine and Surgery, Insubria University, Varese, Italy;
9. Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA;
10. Clinical Research Center, South China Research Center for Acupuncture and Moxibustion, Medical College of Acu-Moxi and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, China;
11. Zhongshan Affiliated Hospital, Guangzhou University of Chinese Medicine, Zhongshan, China; and
12. Department of Medicine and
13. Department of Pathology and Laboratory Medicine, University of Vermont Larner College of Medicine/University of Vermont Medical Center, Burlington, VT