Author(s) affiliations:Frank A Sloana,b, M Angelyn Bethelc, Paul P Leed, Derek S Brownb, Mark N Feinglosc
aCenter for Health Policy, Law, and Management, Box 90253, Duke University, Durham, North Carolina, 27708, USA
bDepartment of Economics, Box 90097, Duke University, Durham, North Carolina, 27708, USA
cDepartment of Medicine, Box 3921, Duke University Medical Center, Durham, North Carolina, 27710, USA
dDepartment of Ophthalmology, Box 3802, Duke University Medical Center, Durham, North Carolina, 27710, USA