Comment--endoscopic quality and control.
Cotton
P B
PB
D004501:Education, Medical; D016099:Endoscopy, Gastrointestinal / Q000592:standards*; D005762:Gastroenterology / Q000193:education / Q000592:standards*; D017408:Guidelines as Topic; D006801:Humans; D011786:Quality Control; D013038:Specialization; D014481:United States