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Gallagher EJ, Esses D, Lee C, Lahn M, Bijur PE
Randomized clinical trial of morphine in acute abdominal pain
Ann Emerg Med. 2006 Aug;48(2):150-60, 160.e1-4
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Thomas SH, Silen W, Cheema F, Reisner A, Aman S, Goldstein JN, Kumar AM, Stair TO
Effects of morphine analgesia on diagnostic accuracy in Emergency Department patients with abdominal pain: a prospective, randomized trial
J Am Coll Surg. 2003 Jan;196(1):18-31