1. From the Department of Oral and Maxillofacial Radiology (A.T., Y.S., K.L.), Hiroshima University Hospital, Japan; and the Departments of Obstetrics and Gynecology, Division of Clinical Medical Science (M.S., M.T., K.O.), Oral and Maxillofacial Radiology, Division of Medical Intelligence and Informatics (M.O., K.T.), and Cardiovascular Physiology and Medicine (M.Y., Y.H.), Graduate School of Biomedical Sciences, Hiroshima University, Japan.