RT Journal Article SR Electronic T1 DEEP VEIN THROMBOSIS AFTER AIR TRAVEL JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 249 OP 249 VO 27 IS 177 A1 F. S. Preston YR 1977 UL http://bjgp.org/content/27/177/249.1.abstract AB