1. Division of Pulmonary and Critical Care Medicine, Department of Internal MedicineUniversity of MichiganAnn ArborMichigan
2. Center for Clinical Management ResearchVA Ann Arbor Healthcare SystemAnn ArborMichigan
3. Department of Emergency MedicineHarborview Medical CenterSeattleWashington
4. Division of Critical Care MedicineAlbert Einstein College of Medicine of Yeshiva UniversityNew YorkNew York
5. Division of Pulmonary and Critical Care Medicine, Department of MedicineOregon Health and Science, University School of MedicinePortlandOregon
6. Division of Pulmonary and Critical CareUniversity of ColoradoDenverColorado
7. Division of Pulmonary and Critical Care Medicine, Department of Internal MedicineUniversity of WashingtonSeattleWashington
8. Massachusetts General HospitalBostonMassachusetts