作者单位:Univ Virginia Hlth Syst, Dept Publ Hlth Sci, Charlottesville, VA USA[1]Wake Forest Baptist Hlth, Dept Radiol, Winston Salem, NC USA[2]Univ Virginia Hlth Syst, Dept Radiol & Med Imaging, POB 800170, Charlottesville, VA 22908 USA[3]NYU, Dept Radiol, Langone Med Ctr, 560 1St Ave, New York, NY 10016 USA[4]