1. From the From Mid America Heart Institute of Saint Luke’s Hospital (S.V.A., C.D., K.J.R., S.G., J.A.S.), Kansas City, Mo; Washington University in St. Louis (S.V.A., G.E.S.), St. Louis, Mo; University of Missouri at Kansas City (C.D., S.M., J.A.S.), Kansas City, Mo; University of Chicago (H.A.), Chicago, Ill; and Children’s Mercy Hospital and Clinics (O.O.), Kansas City, Mo.