RT Journal Article SR Electronic T1 DIAGNOSTIC CERTAINTY JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 770 OP 770 VO 22 IS 124 A1 Morrell, D. C. YR 1972 UL http://bjgp.org/content/22/124/770.1.abstract AB