1. Department of Biomaterials; Institute for Surgical Sciences; Sahgrenska Academy; University of Gothenburg; Gothenburg Sweden
2. Department of Oral & Maxillofacial Surgery; NÄL Medical Centre Hospital; Trollhättan Sweden
3. Institut Straumann; Basel Switzerland
4. Department of Periodontology and Implant Dentistry; New York University, College of Dentistry; New York NY USA
5. Periodontology Unit; Department of Clinical Research; UCL Eastman Dental Institute; London UK