1. Center for Quality and Productivity Improvement, University of Wisconsin-Madison, 1550 Engineering Drive, Madison, WI 53706, USA
2. Department of Industrial and Systems Engineering, University of Wisconsin-Madison, 1513 University Avenue, Madison, WI 53706, USA
3. Geisinger Health Plan, 108 Woodbine Lane, Danville, PA 17822, USA
4. Abt Associates, 55 Wheeler Street, Cambridge, MA 02138, USA
5. Geisinger Health System, 100 N. Academy Avenue, Danville, PA 17822, USA