Affiliation: | 1. Department of Radiology, University of North Carolina Hospitals, UNC at Chapel Hill, CB 7510, 2001 Old Clinic Building, Chapel Hill, NC 27599-7510, USA;2. Department of Radiology, HRH Princess Maha Chakri Sirindhorn Medical Center, Srinakharinwirot University, 62 Moo 7, Khlong Sip, Ongkharak, Nakhon Nayok, Thailand |