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Kirkup B. London, England: Crown Copyright; 2020. ISBN 9781528622714.
de Bienassis K, Llena-Nozal A, Klazinga N for the Organisation for Economic Co-operation and Development. Paris, France: OECD Publishing; 2020. OECD Health Working Papers, No. 121.
Office of the Inspector General. Washington, DC: Department of Veterans Affairs; July 28, 2020. Report Number 19-07507-214.
The Royal Pharmaceutical Society.
Sydney, Australia: Australian Commission on Safety and Quality in Health Care; 2008. ISBN: 9780980346275.