What is a normal upper gastrointestinal tract?

@article{Walker1991WhatIA,
  title={What is a normal upper gastrointestinal tract?},
  author={A. P. Walker and Betty F Walker and Isidor Segal},
  journal={BMJ},
  year={1991},
  volume={302 6787},
  pages={
          1276-7
        }
}
  • A. P. Walker, Betty F Walker, Isidor Segal
  • Published in BMJ 1991
  • Medicine
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