Funding for this research was provided by:
National Science Foundation (IOS-1444448, 1355406)
Cecil G. Sheps Center for Health Services Research, University of North Carolina, Chapel Hill (5070-21000-038-00D)
Received: 20 November 2018
Accepted: 30 January 2019
First Online: 6 February 2019
Compliance with ethical standards
: Authors have no conflict of interest to declare.