%0 Journal Article %A Toru Kadowaki %A Shuichi Yano %T Morphine in acute chronic obstructive pulmonary disease exacerbation %D 2021 %R 10.1136/bcr-2020-239739 %J BMJ Case Reports %P e239739 %V 14 %N 4 %U https://casereports.bmj.com/content/bmjcr/14/4/e239739.full.pdf