1. ITI Research Institute for Dental and Skeletal Biology, University of Bern, Switzerland;
2. ACTA, Section of Oral Implantology and Prosthetic Dentistry, Department of Oral Function, Amsterdam, The Netherlands;
3. Department of Science and Technology, University of Twente, The Netherlands; and
4. Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern, Switzerland