1. Department of Periodontology; Faculty of Odontology; University of Malmö; Malmö Sweden
2. Division of Oral Surgery; School of Dentistry; Medical University of Vienna; Vienna Austria
3. Institute of Pathophysiology and Allergy Research; Center of Physiology and Pathophysiology; Medical University of Vienna; Vienna Austria
4. Department of Orthodontics and Dentofacial Orthopedics; School of Dental Medicine; Department of Orthodontics; University of Bern; Bern Switzerland
5. Department of Oral & Maxillofacial Surgery; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark