1. University of Athens; 28 Doukissis Plakentias Street 11523 Athens Greece
2. Lehigh Valley Hospital; Allentown PA USA
3. University of Alabama at Birmingham; Birmingham AL USA
4. University of California; Los Angeles CA USA
5. Case Western Reserve University; Cleveland OH USA
6. Tufts Medical Center and Tufts University; Boston MA USA
7. VA Medical Center; Birmingham AL USA