title: Assessing the Effectiveness of Counter Matching for Improving the Efficiency of the Nested Case-Control Design in Observational Studies.
authors.affiliation: FV & JK Consulting Ltd, Guildford, UK.
authors.forename: V
authors.initials: V
authors.lastname: Kiri
authors.affiliation: University of Limerick, Limerick, Ireland.
authors.forename: G
authors.initials: G
authors.lastname: MacKenzie