What search strategies were used to identify relevant studies?
The search was run on Medline and Embase using a health economic filter, from September 2009, to ensure recent publications that had not yet been indexed by the economic databases were identified. The quality of life search was run on Medline and Embase using a quality of life filter, from January 2002. Where possible, searches were restricted to papers published in English. Studies published in languages other than English were not reviewed. The health economic search strategies are included in appendix N. The general heart failure economic search was updated on 6 December 2017. No papers published after this date were considered.