1. Stratingh Institute for ChemistryUniversity of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
2. Brigham and Women's Hospital, Division of Rheumatology, Inflammation, and ImmunityHarvard Medical School, Hale BTM 60 Fenwood Road Boston MA 02115 USA
3. Department of Infectious Diseases and ImmunologyFaculty of Veterinary MedicineUtrecht University Yalelaan 1 3584 CL Utrecht The Netherlands