1. Department of Systems & Industrial Engineering, University of Arizona, Tucson, AZ, USA
2. Department of Medicine, Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, College of Medicine-Tucson, University of Arizona, Tucson, AZ, USA
3. Department of Emergency Medicine, College of Medicine-Tucson, University of Arizona, Tucson, AZ, USA
4. Department of Biomedical Engineering, University of Arizona, Tucson, AZ, USA