Affiliation: | aKey Laboratory for Oral Biomedical Engineering Ministry of Education, School and Hospital of Stomatology, Wuhan University, Luoyu Road 237, 430079 Wuhan, PR China;bDepartment of Orthodontics and Oral Biology, Radboud University Nijmegen Medical Centre, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands |