Herrmann, Howard C.From the Hospital of the University of Pennsylvania and the Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA (H.C.H.); and the Department of Cardiovascular Surgery, University Hospital Zurich, Zurich, Switzerland (F.M.).
Maisano, FrancescoFrom the Hospital of the University of Pennsylvania and the Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA (H.C.H.); and the Department of Cardiovascular Surgery, University Hospital Zurich, Zurich, Switzerland (F.M.).