1. Jianhui Hu ( ) is a research associate at the Center for Health Policy and Health Services Research, Henry Ford Health System, in Detroit, Michigan.
2. Meredith D. Gonsahn was a research associate at the Center for Health Policy and Health Services Research, Henry Ford Health System, at the time of this research. She is now a study coordinator at the Atlanta Veterans Affairs Medical Center, in Georgia.
3. David R. Nerenz is director of the Center for Health Policy and Health Services Research, Henry Ford Health System.