RT Journal Article SR Electronic T1 Clinical aviation medicine: safe travel by air JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 81 OP 81 DO 10.7861/clinmedicine.2-1-81 VO 2 IS 1 A1 Abdullah A Alabdulgader YR 2002 UL http://www.rcpjournals.org/content/2/1/81.1.abstract AB