RT Journal Article SR Electronic T1 Medical sickness certification: why not review the role of the general practitioner? JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 313 OP 314 VO 40 IS 337 A1 D Murfin YR 1990 UL http://bjgp.org/content/40/337/313.abstract AB