The study reviews all the literature on the monetary valuation of a quality-adjusted life year. Only 6 studies were found to comply with the criterion, as the literature on the topic is very scarce.
Iskedjian, M., Lelorier, J., Gafni, A., & Navarro, V. (2011). PHP158 Determining the Monetary Value of a Quality-Adjusted Life Year (QALY): Systematic Review of the Evidence. Value in Health, 14(7), A362. https://doi.org/10.1016/j.jval.2011.08.708