?:authorAffiliation
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[\'Wei Lyu is a research associate in the Department of Health Management and Policy, College of Public Health, University of Iowa, in Iowa City, Iowa.\', \'George L. Wehby (george-wehby@uiowa.edu) is a professor in the Department of Health Management and Policy, College of Public Health, at the University of Iowa, and a research associate at the National Bureau of Economic Research.\']
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