1 Department of Medical Imaging, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
2 Department of Medical Imaging, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Radiology, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. Electronic address: tsjaw@kmu.edu.tw.