Yen Yi-Hao, Wang Jing-Houng, Lu Sheng-Nan, Changchien Chi-Sin
Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan.
J Ultrasound Med. 2005 Jun;24(6):855-9. doi: 10.7863/jum.2005.24.6.855.