1. Justin Dimick ( ) is an associate professor of surgery and chief of the Division of Minimally Invasive Surgery, University of Michigan, in Ann Arbor.
2. Joel Ruhter is a senior research analyst at ArborMetrix, in Ann Arbor.
3. Mary Vaughan Sarrazin is director of the Data Management and Analysis Cores, Center for Comprehensive Access and Delivery Research and Evaluation, Iowa City Veterans Affairs Health Care System, in Iowa.
4. John D. Birkmeyer is the George D. Zuidema Professor of Surgery and director of the Center for Healthcare Outcomes and Policy at the University of Michigan.