1. Department of Rehabilitation Medicine, Affiliated Hospital of Weifang Medical University, Weifang, China.
2. School of Management, Weifang Medical University, Weifang, China.
3. School of Economics & Management, Harbin Institute of Technology, Weihai, China.
4. Department of Pediatrics, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China.