Layte, R., Nolan, A., McGee, H., and O'Hanlon, A. (2009). Do Consultation Charges Deter General Practitioner Use Among Older People? A Natural Experiment, Social Science & Medicine, Vol. 68 Issue 8, April 2009, pp. 1432-1438, The Netherlands: Elsevier, http://dx.doi.org//10.1016/j.socscimed.2009.02.014