RT Journal Article SR Electronic T1 The heart and lungs at extreme altitude. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 631 OP 633 DO 10.1136/thx.49.7.631 VO 49 IS 7 A1 Reeves, J T A1 Welsh, C H A1 Wagner, P D YR 1994 UL http://thorax.bmj.com/content/49/7/631.abstract AB