RT Journal Article SR Electronic T1 Accuracy of venous blood oxygen pressure depends on arterial blood oxygen pressure JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1207 OP 1208 DO 10.1183/09031936.00097909 VO 34 IS 5 A1 G. S. Zavorsky YR 2009 UL http://erj.ersjournals.com/content/34/5/1207.abstract AB