1 Indian Health Service, US Department of Health and Human Services, Wind River Service Unit, Wyoming, USA; Medecins Sans Frontieres/Doctors without Borders, New York, New York, USA. te2105@columbia.edu.
2 Division of Pulmonary, Critical Care and Sleep Medicine, University at Buffalo and Western New York Veterans Affairs Healthcare System, Buffalo Veterans Affairs (VA) Medical Center, Buffalo, New York, USA.
3 Jericho Road Community Health Center, Buffalo, New York, USA.