1. From the Department of Cardiology, Heart Center, University of Leipzig (C.W., L.G., V.A., S.E., M.S., K.F., G.S.); Coordination Center for Clinical Trials Leipzig (G.G.); University Hospital for Children and Adolescents, University of Leipzig (A.K., W.K.); and Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Hospital Leipzig (A.L., M.B., J.T.), Leipzig, Germany.