Anneline C Hinrichs1,2, Joel A G van Roon3,4. 1. Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands. 2. Laboratory for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands. 3. Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands. j.vanroon@umcutrecht.nl. 4. Laboratory for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands. j.vanroon@umcutrecht.nl.