RT Journal Article SR Electronic T1 A basic polyphasic screening programme in preventive medicine. JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 261 OP 271 VO 15 IS 4 A1 E. M. Clark YR 1968 UL http://bjgp.org/content/15/4/261.abstract AB