Author information:
(1)From the Departments of Rheumatology and Clinical Immunology and Oral and 
Maxillofacial Surgery, University of Groningen, University Medical Center 
Groningen, the Netherlands.
(2)R.V. Moerman, MD, Department of Rheumatology and Clinical Immunology, 
University of Groningen, University Medical Center Groningen; S. Arends, PhD, 
Department of Rheumatology and Clinical Immunology, University of Groningen, 
University Medical Center Groningen; P.M. Meiners, MD, PhD, Department of Oral 
and Maxillofacial Surgery, University of Groningen, University Medical Center 
Groningen; A. Vissink, MD, PhD, Department of Oral and Maxillofacial Surgery, 
University of Groningen, University Medical Center Groningen; F.K. Spijkervet, 
MD, PhD, Department of Oral and Maxillofacial Surgery, University of Groningen, 
University Medical Center Groningen; F.G. Kroese, PhD, Department of 
Rheumatology and Clinical Immunology, University of Groningen, University 
Medical Center Groningen; E. Brouwer, MD, PhD, Department of Rheumatology and 
Clinical Immunology, University of Groningen, University Medical Center 
Groningen; H. Bootsma, MD, PhD, Department of Rheumatology and Clinical 
Immunology, University of Groningen, University Medical Center Groningen.
(3)From the Departments of Rheumatology and Clinical Immunology and Oral and 
Maxillofacial Surgery, University of Groningen, University Medical Center 
Groningen, the Netherlands. h.bootsma@umcg.nl.
(4)R.V. Moerman, MD, Department of Rheumatology and Clinical Immunology, 
University of Groningen, University Medical Center Groningen; S. Arends, PhD, 
Department of Rheumatology and Clinical Immunology, University of Groningen, 
University Medical Center Groningen; P.M. Meiners, MD, PhD, Department of Oral 
and Maxillofacial Surgery, University of Groningen, University Medical Center 
Groningen; A. Vissink, MD, PhD, Department of Oral and Maxillofacial Surgery, 
University of Groningen, University Medical Center Groningen; F.K. Spijkervet, 
MD, PhD, Department of Oral and Maxillofacial Surgery, University of Groningen, 
University Medical Center Groningen; F.G. Kroese, PhD, Department of 
Rheumatology and Clinical Immunology, University of Groningen, University 
Medical Center Groningen; E. Brouwer, MD, PhD, Department of Rheumatology and 
Clinical Immunology, University of Groningen, University Medical Center 
Groningen; H. Bootsma, MD, PhD, Department of Rheumatology and Clinical 
Immunology, University of Groningen, University Medical Center Groningen. 
h.bootsma@umcg.nl.