RT Journal Article SR Electronic T1 BET 3. NORMAL PARTIAL PRESSURE OXYGEN IN ROOM AIR AS A RULE-OUT FOR PULMONARY EMBOLISM JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 290 OP 291 DO 10.1136/emj.2009.072124 VO 26 IS 4 YR 2009 UL http://emj.bmj.com/content/26/4/290.abstract AB