RT Journal Article SR Electronic T1 Influenza-related pneumonia JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 299 OP 300 DO 10.7861/clinmedicine.12-3-299a VO 12 IS 3 A1 Fergus Dignan YR 2012 UL http://www.rcpjournals.org/content/12/3/299.2.abstract