Authors
Xiang-Long Zeng
Professor, Department of Orthodontics, School of Stomatology, Beijing Medical University, Beijing, China
Carl-Magnus Forsberg
Associate Professor, Department of Orthodontics, Faculty of Dentistry, Karolinska Institute, Stockholm, Sweden
Sten Linder-Aronson
Pofessor, Department of Orthodontics, Faculty of Dentistry, Karolinska Institute, Stockholm, Sweden