Key points are not available for this paper at this time.
Funding: I. Bardhan is grateful for the financial support provided by The University of Texas at Austin Charles and Elizabeth Prothro Regents Chair. E. Oborn is supported in part by the National Institute for Health Research Applied Research Centre Collaborations for Leadership in Applied Health Research and CareWest Midlands Grant WMCLAHRC-2014-1.
Bardhan et al. (Tue,) studied this question.