RT Book, Section SR Electronic(1) A1 George, Laura YR 2020 T1 The top to bottom of endoscopy: a practical approach T2 BSAVA Congress Proceedings 2020 PB British Small Animal Veterinary Association DO 10.22233/9781910443774.21.3 UL https://www.bsavalibrary.com/content/chapter/10.22233/9781910443774.ch21sec3