1. VA Pittsburgh Healthcare System; Pittsburgh PA USA
2. Hamad Healthcare Quality Institute and Hamad Medical Corporation; Doha Qatar
3. Weill Cornell Medical College; Doha Qatar
4. Weill Cornell Medical College; New York NY USA
5. University of Pittsburgh School of Medicine; Pittsburgh PA USA
6. Massachusetts General Hospital; Boston MA USA
7. Harvard Medical School; Boston MA USA
8. University of Cincinnati College of Medicine/UC Health; Cincinnati OH USA