1. Discipline of Orthodontics Dental School Department of Medical and Surgical Specialties Radiological Sciences and Public Health University of Brescia Brescia Italy
2. Orthodontics, Division of Paediatric Dentistry and Orthodontics Faculty of Dentistry The University of Hong Kong Hong Kong SAR People's Republic of China
3. Oral and Maxillofacial Radiology Division of Applied Oral Sciences and Community Dental Care Faculty of Dentistry The University of Hong Kong Hong Kong SAR People's Republic of China
4. Academic Centre for Dentistry Amsterdam (ACTA) Amsterdam The Netherlands
5. Department of Oral Health and Medicine University Center for Dental Medicine Basel (UZB) University of Basel Basel Switzerland
6. Dental Materials Science Division of Applied Oral Sciences and Community Dental Care Faculty of Dentistry The University of Hong Kong Hong Kong SAR People's Republic of China