1. Department of Internal Medicine, University of New Mexico, Albuquerque, NM 87106, USA
2. Department of Mathematics and Statistics, University of New Mexico, Albuquerque, NM 87106, USA
3. Division of Surgical Oncology, University of New Mexico, Albuquerque, NM 87106, USA
4. Division of Pulmonology and Critical Care, Allegheny Health Network, Pittsburg, PA 15212, USA
5. Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS 66160, USA
6. Department of Family and Community Medicine, Texas Tech Health Sciences Center, Lubbock, TX 79409, USA