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
7. Sigmund Freud University, Vienna, Austria