Reference:
Cooper C, O’Mara-Eves A, Rogers M, Bethel A, Lowe J, Crathorne L, Gomersall A. The best of the UK? A report on the value and future of UK databases in the health and social care fields: a systematic map protocol. BMJ open 2012; 2:e001411. doi:10.1136/bmjopen-2012-001411.