Baseline characteristics of patients, including past gastrointestinal history.

1Alcohol intake was reported as occasional in all cases. 2Presence of symptoms considered as originating in the gastroduodenal region, in the absence of any organic, systemic, or metabolic disease that is likely to explain the symptoms (Roma III criteria). 3One patient presented in her past history pyloric stenosis surgery, showing normal esophagogram and barium enema. 4Five patients presented partial colectomy previously of being admitted in the international health centre. After the surgery, one of them presented megasigma, and another one dolichomegacolon. The other three presented dolichocolon. All of them did not showed alterations in esophagogram.