7Stoker J, van Randen A, Lameris W, et al. Imaging patients with acute abdominal pain [J]. Radiology, 2009,253 ( 1 ) :31-46.
8Sala E, Watson C J, Beadsmoore C, et al. A randomized, controlled trial of routine early abdominal computed tomography in patients presenting with non-specific acute abdominal pain [ J]. Clinical Radiology, 2007,62(10) :961-969.
9Menees S,Elta G.Endoscopic retrograde cholangiopancreatography during pregnancy.Gastrointest Endosc Clin N Am,2006,16:41-57.
10Shelton J,Linder JD,Rivera-Alsina ME,et al.Commitment,confirmation,and clearance:new techniques for nonradiation ERCP during pregnancy (with videos).Gastrointest Endosc,2008,67:364-368.