%0 Book Section %A Hall, Edward J. %T Flexible endoscopy: upper gastrointestinal tract %B BSAVA Manual of Canine and Feline Endoscopy and Endosurgery %D 2008 %I British Small Animal Veterinary Association %R doi:https://doi.org/10.22233/9781905319572.4 %U https://www.bsavalibrary.com/content/chapter/10.22233/9781905319572.chap4