61.   This may partly explain the lower prevalence rate found in several previous studies in comparison with our results.

62.   In agreement with previous studies, we found that gastric metaplasia was significantly more prevalent in patients with duodenal ulcer disease than in patients with functional dyspepsia.

63.   We achieved that in a previous study, and before this study we showed these conditions with a vaginal ultrasonic probe during distension series of the rectum.

64.   We showed this in a previous study of the isolated perfused procine duodenum.

65.   Previous gastric surgery was not a feature of our tumour group as has been suggested by previous studies.

66.   To our knowledge, no previous studies of mucosal concentrations are available.

67.   In previous studies we have shown that in the colon of non-methanogenic human subjects, significant populationsof sulphate reducing bacteria exist.

68.   Administration of indomethacin caused no decrease in the glucose induced insulin release in our preparation confirming previous studies.

69.   Previous studies in humans have shown that synthesis of leukotrienes correlates with gastroduodenal mucosal injury.

70.   This is in agreement with previous studies.