1. Tianjin Medical University 300070 Tianjin, People’s Republic of China
2. Key Laboratory of Tissue Repair and Regeneration of PLA, and Beijing Key Research Laboratory of Skin Injury, Repair and Regeneration Fourth Medical Center of General Hospital of PLA 100048 Beijing, People’s Republic of China
3. Wound Healing and Cell Biology Laboratory, Institute of Basic Medical Sciences General Hospital of PLA 100853 Beijing, People’s Republic of China