Color flow sonography in evaluating the resectability of periampullary and pancreatic tumors.
Ralls PW, Wren SM, Radin R, Stain SC, Yang J, Parekh D. Color flow sonography in evaluating the resectability of periampullary and pancreatic tumors. J Ultrasound Med. 1997 Feb; 16(2):131-40.