1. Department of Internal Medicine, Division of Vascular Medicine, University Medical Centre Groningen, University of Groningen, 9712 Groningen, The Netherlands
2. Department of Rheumatology and Clinical Immunology, University Medical Centre Groningen, University of Groningen, 9712 Groningen, The Netherlands
3. Department of Pulmonary Diseases and Tuberculosis, University Medical Centre Groningen, University of Groningen, 9712 Groningen, The Netherlands
4. Department of Pathology and Medical Biology, University Medical Centre Groningen, University of Groningen, 9712 Groningen, The Netherlands