RT Journal Article SR Electronic T1 Harms of overoxygenation in patients with exacerbation of chronic obstructive pulmonary disease JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E762 OP E763 DO 10.1503/cmaj.170196 VO 189 IS 22 A1 Graeme Rocker YR 2017 UL http://www.cmaj.ca/content/189/22/E762.abstract AB