RT Journal Article SR Electronic T1 A concise textbook of gastroenterology JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 803 OP 804 VO 23 IS 136 A1 Everett, M. T. YR 1973 UL http://bjgp.org/content/23/136/803.2.abstract AB