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This study by Saint-Lary et al. was an interesting read and very informative. I commend the authors for uncovering so much regarding General Practitioner attitudes towards payment for performance schemes.
One thing that stood out to me was the use of a €100 incentive for study participants. It is not mentioned within the article whether study participants were aware of this reward before agreeing to participate in the study. This would be useful to know in order to understand whether the opinions and attitudes expressed in this study are truly representative of all French General Practitioners, or rather only of those who tend to be more financially driven. For example, the finding that all General Practitioners within the study considered the maximum bonus achievable to be low, may be explained by the fact that these doctors are particularly financially driven.
Given this possibility, I hope this point may be taken into account when interpreting the findings of this paper.