title: Letter: Straining, sitting, and squatting at stool.
mesh_terms: D001663:Bilirubin / Q000097:blood; D001786:Blood Glucose / Q000032:analysis; D002784:Cholesterol / Q000097:blood; D003404:Creatinine / Q000097:blood; D007501:Iron / Q000097:blood; D008792:Metric System; D014503:Urate Oxidase / Q000097:blood
chemical_list: D001786:Blood Glucose; D002784:Cholesterol; D003404:Creatinine; D007501:Iron; D014503:Urate Oxidase; D001663:Bilirubin