[1]Division of Oral Biology and Medicine, School of Dentistry, University of California at Los Angeles, Los Angeles, USA;
[2]State Key Laboratory of Oral Disease, West China School ofStomatology, Sichuan University, Chengdu, China;
[3]Section of Orthodontics, School of Dentistry, University of California at Los Angeles, Los Angeles, USA;
[4]Department ofBioengineering, Henry Samueli School of Engineering and Applied Science, University of California at Los Angeles, Los Angeles, USA;