title: Corrigendum to 'Analgesic prescribing patterns in Norwegian nursing homes from 2000 to 2011: trend analyses of four data samples'.
authors.affiliation: Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.
authors.forename: Reidun
authors.initials: R
authors.lastname: Sandvik
authors.affiliation: National Advisory Unit on Ageing and Health, Oslo Universitetssykehus HF, Oslo, Norway.
authors.forename: Geir
authors.initials: G
authors.lastname: Selbaek
authors.affiliation: National Advisory Unit on Ageing and Health, Oslo Universitetssykehus HF, Oslo, Norway The Alzheimer's Society Systematic Review Group.
authors.forename: Oyvind
authors.initials: O
authors.lastname: Kirkevold
authors.affiliation: Centre for Age-Related Medicine, Stavanger University Hospital, Stavanger, Norway.
authors.forename: Dag
authors.initials: D
authors.lastname: Aarsland
authors.affiliation: Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.
authors.forename: Bettina Sandgathe
authors.initials: BS
authors.lastname: Husebo