RT Journal Article SR Electronic T1 RESPONSE RATES TO QUESTIONNAIRES JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 578 OP 579 VO 26 IS 169 A1 Meynen, F. G. C. YR 1976 UL http://bjgp.org/content/26/169/578.3.abstract AB