1. From the Department of Internal Medicine I, University Clinic of Wuerzburg, Wuerzburg, Germany (P.-A.A.-L., P.J., S.U., T.W., S.F., T.P.); Comprehensive Heart Failure Center Wuerzburg, Wuerzburg, Germany (P.-A.A.-L., S.U., T.W., T.P.); Institute of Physiology, University Wuerzburg, Wuerzburg, Germany (M.A., K.S.); and University Clinic and Polyclinic for Internal Medicine III, University Clinic Halle, Halle, Germany (S.F.).