@incollection{:/content/chapter/10.22233/9781905319572.chap4, author = "Hall, Edward J.", title = "Flexible endoscopy: upper gastrointestinal tract", booktitle = "BSAVA Manual of Canine and Feline Endoscopy and Endosurgery", publisher = "British Small Animal Veterinary Association", year = "2008", pages = "42-72", url = "https://www.bsavalibrary.com/content/chapter/10.22233/9781905319572.chap4" }