1. University of Alabama at BirminghamBirmingham, Alabama
2. UAB Lung Health CenterBirmingham, Alabama
3. Brigham and Women’s HospitalBoston, Massachusetts
4. VA Boston Healthcare SystemJamaica Plain, Massachusetts
5. National Jewish HealthDenver, Colorado
6. University of MichiganAnn Arbor, Michigan
7. Birmingham VA Medical CenterBirmingham, Alabama