1 Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg 20246 Germany.
2 Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg 20246 Germany; Hamburg Center for Translational Immunology, University Medical Center Hamburg-Eppendorf, Hamburg 20246 Germany; Martin Zeitz Center for Rare Diseases, University Medical Center Hamburg-Eppendorf, Hamburg 20246 Germany. Electronic address: c.schramm@uke.de.