1. Department of Laboratory Medicine; Medical University of Vienna; Vienna; Austria
2. Department of Internal Medicine III; Division of Nephrology and Dialysis; Medical University of Vienna; Vienna; Austria
3. Department for Biosimulation and Bioinformatics; Center for Medical Statistics; Informatics and Intelligent Systems; Medical University of Vienna; Vienna; Austria
4. Metabolic Unit; Institute of Biomedical Engineering; National Research Council; Padova; Italy
5. Department of Internal Medicine III; Division of Endocrinology and Metabolism; Medical University of Vienna; Vienna; Austria