Chao-Lin Lee1, Hsueh-Han Wang2, Hsuan-Ming Tsao3. 1. Department of Internal Medicine, National Yang Ming University Hospital, Yi-Lan, Taiwan. 2. Department of Radiology, National Yang Ming University Hospital, Yi-Lan, Taiwan. 3. Department of Internal Medicine, National Yang Ming University Hospital, Yi-Lan, Taiwan. Electronic address: hmtsao.pohai@msa.hinet.net.