1. Lee D Bergman U . Studies of drug utilization. In: Strom BL Kimmel SE Hennessey S (eds). Pharmacoepidemiology. 5th edn. Wiley, 2012.
2. The Danish Health Data Authority. Register of Medicinal Products Statistics. http://sundhedsdatastyrelsen.dk/da/registre-og-services/om-de-nationale-sundhedsregistre/sygdomme-laegemidler-og-behandlinger/laegemiddelstatistikregisteret (1 January 2016, date last accessed).
3. Pottegård A, Schmidt SAJ, Kildemoes HW, Sørensen HT, Hallas J, Schmidt M. Resource Profile: The Danish National Prescription Registry (NPR). Int J Epidemiol (In press).
4. Danish Health Data Authority. MEDSTAT. http://www.medstat.dk/en (15 February 2016, date last accessed).
5. Danish Health Data Authority. Quarterly Drug Statistics. http://esundhed.dk/sundhedsregistre/LSR/Sider/MEDQTR-Tabel.aspx (15 February 2016, date last accessed).