Specially designed endoscopes for visualizing the interior surface of the colon.
https://www.sfed.org/sites/www.sfed.org/files/2022-06/Coloscopie%20assistee%20a%CC%80%20l%27eau%20version%20finale%20V2.pdf 2022 France practice guideline colonoscopes Water colonoscopy water Bacteriology judgment streams rivers Water bacteriology counseling bacteriologist
--- http://www.cochrane.org/fr/CD008211 2012 France United Kingdom French french abstract review of literature colonoscopy comparative study colonoscopes colorectal neoplasms