Department of Psychiatry and Psychotherapy, University Hospital, Ludwig-Maximilians-University, 80336 Munich, Germany. Electronic address: Maria.Simon@med.uni-muenchen.de. Department of Neurosciences, Psychiatry Research Group, KUL University of Leuven, Leuven 3000, Belgium. Department of Psychiatry and Psychotherapy, University Hospital, Ludwig-Maximilians-University, 80336 Munich, Germany. Division of Neuroscience, Psychiatry and Clinical Psychobiology Unit, IRCCS San Raffaele Scientific Institute, Milan 20125, Italy. Department of Psychiatry, University Medical Center Groningen, University of Groningen, Groningen 9713 GZ, Netherlands. Department of Immunology, Erasmus Medical Center, Rotterdam 3015 GD, Netherlands. Institute of Laboratory Medicine, University Hospital, Ludwig-Maximilians-University, 81377 Munich, Germany. Foundation Biological Psychiatry, Sofia, Bulgaria. Department of Mental Health, University of Münster, 48149 Münster, Germany. Université Paris Est Créteil, INSERM, IMRB, Translational Neuropsychiatry, F-94010, Créteil, France; AP-HP, Hôpitaux Universitaires H. Mondor, DMU IMPACT, FHU ADAPT, F-94010, Créteil, France. Clinical Neuroimmunology Unit, Institute of Experimental Neurology, IRCCS Ospedale San Raffaele, Milano 20132, Italy. Advanced Practical Diagnostics BVBA, Turnhout 2300, Belgium. Department of Immunology, Erasmus Medical Center, Rotterdam 3015 GD, Netherlands; RMS, Rotterdam, Netherlands.