Chronic obstructive pulmonary disease in the emergency department.
Nick R
NR
Anthonisen
D002170:Canada; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000628:therapy*; D010343:Patient Admission / Q000706:statistics & numerical data*; D014481:United States