1. From the Institute of Clinical Chemistry, University Hospital of Zurich, Zurich, Switzerland (J.R., M.L., D.P., A.v.E., L.R.); Zurich Center of Integrated Human Physiology, University of Zurich, Zurich, Switzerland (J.R., D.P., A.v.E., L.R.); and Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University Graz, Graz, Austria (S.F.).