Table 1. Clinical data of patients.

	Wuerzburg (Germany)	Mwanza (Tanzania)
Age	57,1+21,3 years (SD)	43,2+14,6 years (SD)
Sex	15 male, 20 female	18 male, 12 female
Endoscopic findings	hiatal herniareflux esophagitisBarrett's esophagusgastric ulcergastritisduodenal ulcerPEG placementno abnormality	hiatal herniareflux esophagitisesophageal varicesgastric ulcergastric cancergastritisduodenal ulcerduodenitisno abnormality
No. of biopsy sites:
Duodenum	10	12
Antrum	10	27
Corpus and fundus	15	11