1 Department of Medicine I, Gastroenterology, Hepatology, Endocrinology and Metabolism, Medical University of Innsbruck, Innsbruck, Tirol, Austria heinz.zoller@i-med.ac.at.
2 Christian Doppler Laboratory on Iron and Phosphate Biology, Christian Doppler Forschungsgesellschaft, Innsbruck, Tirol, Austria.
3 Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology & Metabolism, Medizinische Universitat Innsbruck, Innsbruck, Tirol, Austria.