Evaluating blunt abdominal trauma with sonography: a cost analysis. - McKenney,M.G.; McKenney,K.L.; Hong,J.J.; Compton,R.; Cohn,S.M.; Kirton,O.C.; Shatz,D.V.; Sleeman,D.; Byers,P.M.; Ginzburg,E.; Augenstein,J. (Am Surg, 2001)