1. Department of General Dentistry, The Affiliated Stomatological Hospital of Fujian Medical University, Fuzhou, Fujian, China (mainland)
2. Department of Stomatology, Ankang Central Hospital, Ankang, Shaanxi, China (mainland)
3. Department of Stomatology, The 1st Affiliated Hospital, Medical School of Xi’an Jiaotong University, Xi’an, Shaanxi, China (mainland)