Departments of Radiology (H.G., E.F.Y., R.M.S.) and Molecular Virology, Immunology, and Medical Genetics (H.G., R.M.S.), College of Medicine and Public Health and College of Pharmacy (K.K.C.), the Ohio State University, Columbus, Ohio; and Abbott Laboratories (L.L.S.), Abbott Park, Illinois

Departments of Radiology (H.G., E.F.Y., R.M.S.) and Molecular Virology, Immunology, and Medical Genetics (H.G., R.M.S.), College of Medicine and Public Health and College of Pharmacy (K.K.C.), the Ohio State University, Columbus, Ohio; and Abbott Laboratories (L.L.S.), Abbott Park, Illinois

Departments of Radiology (H.G., E.F.Y., R.M.S.) and Molecular Virology, Immunology, and Medical Genetics (H.G., R.M.S.), College of Medicine and Public Health and College of Pharmacy (K.K.C.), the Ohio State University, Columbus, Ohio; and Abbott Laboratories (L.L.S.), Abbott Park, Illinois

Departments of Radiology (H.G., E.F.Y., R.M.S.) and Molecular Virology, Immunology, and Medical Genetics (H.G., R.M.S.), College of Medicine and Public Health and College of Pharmacy (K.K.C.), the Ohio State University, Columbus, Ohio; and Abbott Laboratories (L.L.S.), Abbott Park, Illinois

Departments of Radiology (H.G., E.F.Y., R.M.S.) and Molecular Virology, Immunology, and Medical Genetics (H.G., R.M.S.), College of Medicine and Public Health and College of Pharmacy (K.K.C.), the Ohio State University, Columbus, Ohio; and Abbott Laboratories (L.L.S.), Abbott Park, Illinois