The Munich Barrett follow up study: suspicion of Barrett's oesophagus based on either endoscopy or histology only - what is the clinical significance? - Meining,A.; Ott,R.; Becker,I.; Hahn,S.; Mühlen,J.; Werner,M.; Höfler,H.; Classen,M.; Heldwein,W.; T,R.ösch. (Gut, 2004)