1. Division of General Internal Medicine, Mayo Clinic, Rochester, MN, USA.
2. Department of Pain Medicine, Shenzhen Nanshan People's Hospital, Shenzhen, Guangdong, China.
3. College of Acupuncture and Rehabilitation, Guangzhou University of Traditional Chinese Medicine, Guangzhou, Guangdong, China.
4. Department of Community Internal Medicine, Mayo Clinic, Rochester, MN, USA.
5. Department of Physical Medicine & Rehabilitation, Mayo Clinic, Jacksonville, FL, USA.