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Copyright ©The Author(s) 2021.
World J Gastroenterol. Apr 28, 2021; 27(16): 1751-1769
Published online Apr 28, 2021. doi: 10.3748/wjg.v27.i16.1751
Figure 9
Figure 9  Outflow obstruction with elevated residual pressure and distal pressurization from chronic opioid use.