. Author manuscript; available in PMC: 2018 Sep 22.
Published in final edited form as: J Health Econ. 2018 Feb 7;61:244–258. doi: 10.1016/j.jhealeco.2018.01.005
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).