RT Journal Article SR Electronic T1 Some Pitfalls in General Practice Research JF The Journal of the College of General Practitioners JO J Coll Gen Pract FD British Journal of General Practice SP 242 OP 247 VO 6 IS 2 A1 E. V. Kuenssberg YR 1963 UL http://bjgp.org/content/6/2/242.abstract AB