1. Rethinking primary care user fees: is charging a fee for appointments a solution to NHS underfunding?
2. RAND Corporation. 40 Years of the RAND Health Insurance Experiment. https://www.rand.org/health-care/projects/HIE-40.html
3. NHS Digital. Prescriptions Dispensed in the Community - Statistics for England, 2005-2015. https://digital.nhs.uk/data-and-information/publications/statistical/prescriptions-dispensed-in-the-community/prescriptions-dispensed-in-the-community-statistics-for-england-2005-2015
4. Does charging different user fees for primary and secondary care affect first-contacts with primary healthcare? A systematic review
5. Shortage of general practitioners in the NHS