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Time to maximal activity (Tmax) in patients with normal (group I) and elevated (>40 mm Hg) (group II) sphincter of Oddi basal pressure after 99mTc-DISIDA scanning, with and without morphine provocation. The shaded box indicates the interquartile range and the vertical line the upper and lower adjacent values (the upper or lower quartile ±1.5 times the interquartile range).
