1. University of Mississippi Medical Center, Jackson Chicago, Illinois
2. University of Alabama at Birmingham, Chicago, Illinois
3. Rush Medical Center, Chicago, Illinois
4. University of Arkansas for Medical Sciences, Little Rock, Ann Arbor, Michign
5. University of Michigan Medical School, Veterans Affairs Ann Arbor Healthcare System Germantown, Tennessee, Ann Arbor, Michigan
6. University of Michigan Medical School, Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, Michign