1. From the Ohio State University, Columbus, OH (P.T., S.L., S.R., T.R., M.A.V.); Siemens Medical Solutions USA Inc, Mountain View, CA (S.D.); The Methodist DeBakey Heart and Vascular Center, Houston, TX (S.R.I., M.S.J., S.H.L); and University of California Irvine, Orange, CA (N.D.M.).