1. The Affiliated Stomatological Hospital of Kunming Medical University, Kunming, China
2. Department of Stomatology, The 7th Medical Center of PLA General Hospital, Beijing, China
3. Freetech Technology, Nanjing, China
4. Department of Endodontics, The Dental College of Georgia, Augusta University, Augusta, GA, USA
5. Department of Medical Administration, The 7th Medical Center of PLA General Hospital, Beijing, China
6. Department of Stomatology, 920th Hospital of Joint Logistics Support Force, Kunming, China