1. Department of Oral and Maxillo-facial Implantology; Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiaotong University; Shanghai; China
2. Faculty of Dentistry; the University of Hong Kong; Hong Kong; China
3. Arrail Dental Clinic; Shanghai; China
4. Oral Function and Restorative Dentistry; Section Oral Implantology and Prosthetic Dentistry; LA Amsterdam; The Netherlands