1. Section of Internal Medicine, Department of Medicine, University of Verona, Veneto Region Referral Center for Iron Metabolism Disorders, Azienda Ospedaliera Universitaria Integrata Verona, Verona, Italy;
2. Department of Medicine, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, CA; and
3. Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboud University Medical Center, Nijmegen, The Netherlands