1. a Center for Stem Cell and Tissue Engineering, School of Medicine, Hangzhou, Zhejiang, People's Republic of China
2. b Zhejiang Provincial Key Lab for Tissue Engineering and Regenerative Medicine, Hangzhou, Zhejiang, People's Republic of China
3. c Department of Integrative Medical Biology, Anatomy, Umeå University, Umeå, Sweden
4. d Department of Orthopedics, Second Affiliated Hospital, Hangzhou, Zhejiang, People's Republic of China
5. e Department of Sports Medicine, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China