Department of Oral Implantology and Prosthetic Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University Amsterdam, Gustav Mahlerlaan, 3004, 1081LA Amsterdam, Nord-Holland, the Netherlands.
Department of Osteoporosis, Inselspital Bern University Hospital, Freiburgstrasse 3, CH-3010, Bern, Switzerland.