1. From the Department of Diagnostic, Interventional and Pediatric Radiology (A.T.H., S.F., H.v.T.K.) and Department of Cardiology (S.F., L.C., S.W., A.L., S.B., A.M., J.S., H.S., A.H., F.N., N.B., C.G., L.R., H.T., T.R.), Inselspital University Hospital, University of Bern, Freiburgstrasse, 3010 Bern, Switzerland.