1. From the Department of Cardiology and Pneumology (P.M.B., D.L., K.S., C.Z., D.W., H.-P.S., C.T.) and Berlin-Brandenburg Center for Regenerative Therapies (K.M., S.V.L., C.T.), Charité-Universitätsmedizin Berlin, Berlin, Germany; Department of Cardiac Surgery (B.S.), University of Heidelberg, Heidelberg, Germany.