RT Journal Article SR Electronic T1 Health checks in general practice: a comparison of two invitation letters. JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 432 OP 433 VO 41 IS 351 A1 Norman, P A1 Conner, M T A1 Willits, D G A1 Bailey, D R A1 Hood, D H A1 Coysh, H L YR 1991 UL http://bjgp.org/content/41/351/432.abstract AB