RT Journal Article SR Electronic T1 For some groups traditionally considered to be ‘high risk’, the evidence of an increased risk of severe influenza-associated illness is poor quality JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 110 OP 110 DO 10.1136/eb-2013-101572 VO 19 IS 3 A1 Peter Horby YR 2014 UL http://ebm.bmj.com/content/19/3/110.abstract AB