From the Division of Cardiothoracic Surgery, Hospital of the University of Pennsylvania in Philadelphia (BR., J.E.B., E.B., N.D.D., R.K.M., W.Y.S., P.V.); and Department of Cardiovascular Surgery, Heart Center Freiburg University, Freiburg, Germany (B.R., F.B., M.S., F.A.K.). (At 2014-04)
