H Wen1, J M Hockenberry2, B G Druss2. 1. Department of Health Management & Policy, University of Kentucky College of Public Health, 111 Washington Avenue, CPH 103C, Lexington, KY, USA. hefei.wen@uky.edu. 2. Department of Health Policy & Management, Emory University Rollins School of Public Health, 1518 Clifton Road NE., Atlanta, GA, USA.