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Formal consent was not required because data is anonymous.The study protocol of the medication review project at the nursing homes, which generated part of the data used here, was presented to the Regional Committee in Medical Research Ethics in South-East Norway (reference no. 2015\/786) and the Norwegian Centre for Research Data (reference no. 43659). Both bodies concluded that their formal approval was not needed. The other part of the data used here was aggregated tabulated data retrieved from the Norwegian Prescription Database (NorPD). No permissions were required to access and retrieve the study data. The privacy of the individual is strictly protected and data is anonymous.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}},{"value":"Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Publisher\u2019s Note"}}],"article-number":"49"}}