1. Department of Cardiovascular Medicine, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
2. Department of Orthopaedics, Affiliated Hospital of Hebei College of Traditional Chinese Medicine, Hebei 050011, China
3. Department of Epidemiology, College of global public health, New York University, 726 broad way, New York, NY 10003, U.S.A.
4. Department of Integrated Traditional Chinese and Western Medicine, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300193, China