Received: 11 December 2017
Accepted: 2 August 2018
First Online: 15 August 2018
Ethics approval and consent to participate
: The study was approved by the McMaster University Research Ethics Board. Written informed consent was obtained from all participants.
: Not Applicable.
: It should be noted that David Feeny, William Furlong, and George W. Torrance have a proprietary interest in Health Utilities Incorporated (HUInc.), Dundas, Ontario, Canada. HUInc. distributes copyrighted Health Utilities Index (HUI) materials and provides methodological advice on the use of the HUI.
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