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BMC Gastroenterology > 2018 > 18 > 1 > 1-7
Best Practice & Research Clinical Gastroenterology > 2009 > 23 > 6 > 793-804
Journal of Pain and Symptom Management > 2006 > 32 > 2 > 118-128
BMC Gastroenterology > 2018 > 18 > 1 > 1-7
Best Practice & Research Clinical Gastroenterology > 2009 > 23 > 6 > 793-804
Journal of Pain and Symptom Management > 2006 > 32 > 2 > 118-128