1 Department of Orthopedics, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, People's Republic of China.
2 Qilu Cell Therapy Technology Co., Ltd, Jinan, Shandong, People's Republic of China; Shandong Yinfeng Life Science Research Institute, Jinan, Shandong, People's Republic of China.