作者单位:Harvard Med Sch, 25 Shattuck St, Boston, MA 02115 USA[1]Massachusetts Gen Hosp, Div Intervent Radiol, 55 Fruit St, Boston, MA 02114 USA[2]North Shore Med Ctr, Dept Internal Med, Salem, MA 01970 USA[3]Albany Med Coll, 43 New Scotland Ave, Albany, NY 12208 USA[4]