1. Department of Medicine, School of Medicine, Johns Hopkins University, Baltimore, MD, USA,
2. Bethlehem Breath Research, Bethlehem, PA, USA,
3. Department of Electrical and Computer Engineering, Rice University, Houston, TX, USA,
4. Department of Environmental Health Sciences, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA, and
5. St. Luke’s University Hospital, Bethlehem, PA, USA