RT Journal Article SR Electronic T1 High Altitude Medicine and Physiology JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 80 OP 80 DO 10.1136/thx.45.1.80-a VO 45 IS 1 A1 MFS. YR 1990 UL http://thorax.bmj.com/content/45/1/80.2.abstract AB