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Effects of morphine analgesia on diagnostic accuracy in emergency department patients with abdominal pain: a prospective, randomized trial
S.H. Thomas, W. Silen, F. Cheema, A. Reisner, S. Aman, J.N. Goldstein, A.M. Kumar, T.O. Stair
Journal of American College of Surgeons, 2003; 196: 18-31