Question: Where did the bristol stool chart come from?
Disambiguated questions and answers: question: Which institution did the bristol stool chart come from?
What journal did the bristol stool chart first come from as a clinical assessment tool?
Who did the bristol stool chart come from?
answer: University Department of Medicine, Bristol Royal Infirmary
Bristol Royal Infirmary
Scandinavian Journal of Gastroenterology
Scand. J. Gastroenterol.
Stephen Lewis and Ken Heaton
Natural Questions answer: Scandinavian Journal of Gastroenterology
Dr. Ken Heaton
England
Dr. Stephen Lewis (from the Wikipedia article "Bristol stool scale")