1 First Department of Medicine, Erlangen University Hospital, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, Germany; Deutsches Zentrum Immuntherapie, Erlangen, Germany. Electronic address: raja.atreya@uk-erlangen.de.
2 First Department of Medicine, Erlangen University Hospital, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, Germany; Deutsches Zentrum Immuntherapie, Erlangen, Germany.