1 Department of Internal Medicine, Section Endocrinology, Amsterdam University Medical Center Utrecht (Amsterdam UMC), Amsterdam Bone Center, Vrije Universiteit Amsterdam, Amsterdam, Netherlands.
2 Department of Periodontology, Academic Centre for Dentistry Amsterdam, University of Amsterdam and Vrije Universiteit, Amsterdam, Netherlands.
3 Department of Orthopedics, University Medical Center (UMC) Utrecht, Utrecht, Netherlands.
4 Center of Medical Genetics, Antwerp University Hospital, University of Antwerp, Antwerp, Belgium.