Rumack, Carol M., MD(Univ of Colorado Health Sciences Center); Wilson, Stephanie R., MD(Univ of Toronto); Charboneau, J. William, MD(Mayo Clinic) The contributors represent the specialties of radiology, pediatrics, obstetrics and gynecology, and maternal fetal medicine. Most come from universities and hospitals in the U.S. and Canada, with one from Italy. Institutions prominently represented include Univ of Toronto, Mayo Clinic, Harvard, Univ of Colorado Health Sciences Center, Univ of Manitoba, and Univ of Michigan.