1. Brown School, Washington University in St. Louis, St. Louis, Missouri 63130;
2. Department of Health Services Management and Policy, College of Public Health, East Tennessee State University, Johnson City, Tennessee 37614;
3. Department of Health Policy and Management, Johns Hopkins University, Baltimore, Maryland 21205;
4. Public Health Department,
5. NORC Walsh Center for Rural Health Analysis, University of Chicago, Chicago, Illinois 60637;, ,