1 I. Department of Medicine, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany; European Reference Network on Hepatological Diseases (ERN RARE-LIVER). Electronic address: a.lohse@uke.de.
2 European Reference Network on Hepatological Diseases (ERN RARE-LIVER); Department of Paediatrics and Adolescent Medicine, Rigshospitalet, Copenhagen, Denmark.