1 Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, P.O. Box 85500, 3508 GA Utrecht, Netherlands.
2 Department of Obstetrics and Gynecology, VU University Medical Center, P.O. Box 7057, 1007 MB Amsterdam, Netherlands.
3 Department of Rheumatology, Amsterdam Rheumatology and Immunology Center, VU University Medical Center, P.O. Box 7057, 1007 MB Amsterdam, Netherlands.
4 Department of Obstetrics and Gynecology, University Medical Center Utrecht, P.O. Box 85500, 3508 GA Utrecht, Netherlands.
5 1st Medical Department and Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK, Vienna, Austria.
6 AUVA Trauma Centre Meidling, Hanusch Hospital, Vienna, Austria.