1. Department of Internal Medicine II; Martin-Luther-University Halle; Halle Germany
2. Institute for Clinical Epidemiology and Applied Biometry; University of Tübingen; Tübingen Germany
3. NMI Technology Transfer GmbH; Reutlingen Germany
4. Department of Research and Development; Gambro Dialysatoren GmbH; Hechingen Germany
5. Institute for Chemistry, Food Chemistry; Martin-Luther-University Halle; Halle Germany
6. Department of Nephrology and Internal Intensive Care Medicine; Charité-Universitaetsmedizin Berlin; Campus Virchow Clinic; Berlin Germany