1. Institute of Dentistry, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
2. Amsterdam University Medical Centers, Academic Centre for Dentistry Amsterdam (ACTA), Department of Oral and Maxillofacial Surgery/Oral Pathology, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
3. Amsterdam UMC, Department of Clinical Chemistry, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
4. Department of Internal Medicine, Division of Endocrinology and Center for Bone Quality, Leiden University Medical Center, Leiden, The Netherlands