1 Department of Stomatology, Navy Specialty Medical Center of Peoples' Liberation Army Navy, Shanghai 200052, People's Republic of China.
2 State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an 710032, People's Republic of China.
3 Department of Stomatology, Changzheng Hospital, The Second Military Medical University, Shanghai 200003, People's Republic of China.