1. Department of Orthopedic and Trauma Surgery, University Hospital Bonn, Bonn, Germany
2. Department of Orthopedic and Trauma Surgery, Xiyuan Hospital, China Academy of Chinese Medical Science, Beijing, China
3. School of Business and Management, Shanghai International Studies University, Shanghai, China
4. Department of Orthopedic Surgery, Hunan Children's Hospital, Hunan, People’s Republic of China