RT Journal Article SR Electronic T1 Acute exacerbations of COPD: it's the weekend but it can't wait until Monday JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1547 OP 1547 DO 10.1183/09031936.00022612 VO 39 IS 6 A1 van den Borst, Bram A1 Wesseling, Geertjan YR 2012 UL http://erj.ersjournals.com/content/39/6/1547.1.abstract AB