1. Department of Radiology, University of Washington School of Medicine, Box 357115, 1959 NE Pacific St, Seattle, WA 98195.
2. Department of Radiology, Division of Diagnostic Radiology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
3. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Washington School of Medicine, Seattle, WA.
4. Department of Radiology, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY.
5. Department of Obstetrics and Gynecology, Maternal-Fetal Medicine Unit, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
6. Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA.