1. Department of Orthodontics and Dentofacial Orthopedics, School of Dental Medicine, University of Bern, Bern, Switzerland
2. Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern, Bern, Switzerland
3. Applied Oral Sciences, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong SAR, China
4. Robert K. Schenk Laboratory of Oral Histology, Department of Periodontology and Department of Oral Surgery and Stomatology, University of Bern, Bern, Switzerland