1. School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, Gansu Province, China
2. Shaanxi Zhonghong Institute of Regenerative Medicine, Xi’an 710003, Shaanxi Province, China
3. Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China
4. Department of Pediatric Dentistry, College of Stomatology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi Province, China
5. Department of Stomatology, General Hospital of Tibetan Military Command, Lhasa 850007, Tibet, China
6. Stomatological Hospital, Southern Medical University, Guangzhou 510280, China