1. Department of Prosthodontics, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, Xinjiang Uygur Autonomous Region, People's Republic of China
2. Department of Stomatology, The First People's Hospital of Kashi, Kashi 844000, Xinjiang Uygur Autonomous Region, People's Republic of China
3. Clinical Medical Research Institute, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, Xinjiang Uygur Autonomous Region, People's Republic of China