1 Department of Periodontal, Oral Center of PLA, Affiliated Changhai Hospital, Second Military Medical University, Shanghai 200081, China. Electronic address: chentielou2010@163.com.
2 Department of Orthodontics, Oral Center of PLA, Affiliated Changhai Hospital, Second Military Medical University, China. Electronic address: uczhang01@163.com.
3 Department of Orthodontics, Oral Center of PLA, Affiliated Changhai Hospital, Second Military Medical University, China.
4 Department of General Dentistry, Affiliated Changhai Hospital, Second Military Medical University, Shanghai 200081, China.