作者单位:Imaging Department, Merck Research Laboratories, Merck and Co. Inc., 770 Sumneytown Pike, West[1]Breast Center, Cancer Hospital, Shantou University Medical College, 7 Raoping Road, Shantou[2]RNA Biologics Department, Merck Research Laboratories, Merck and Co. Inc., 770 Sumneytown Pike[3]