1. Department of Oral Surgery Dr. Sardjito General Hospital Yogyakarta Indonesia
2. Department of Oral Surgery University Medical Center Groningen University of Groningen Groningen The Netherlands
3. Department of Rheumatology and Clinical Immunology University Medical Center Groningen University of Groningen Groningen The Netherlands
4. Department of Rheumatology Dr. Sardjito General Hospital Yogyakarta Indonesia