1. Division of Plastic and Reconstructive Surgery Department of Surgery Stanford University School of Medicine Palo Alto CA USA
2. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases West China Hospital of StomatologySichuan University Chengdu China
3. Dr Gerald Niznick College of Dentistry University of Manitoba Winnipeg MB Canada
4. The Affiliated Hospital of Qingdao University Qingdao China
5. Department of Cariology and Endodontology School of Dentistry Lanzhou University Lanzhou China