RT Journal Article SR Electronic T1 THE PRACTICING PHYSICIAN'S APPROACH TO HEADACHE 2ND EDITION JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 442 OP 442 VO 30 IS 216 A1 D. J. Pereira Gray YR 1980 UL http://bjgp.org/content/30/216/442.1.abstract AB