1. Department of Internal Medicine, Divisions of Hospital and Adult Thrombosis Medicine, Texas Tech University Health Sciences Center and Paul L Foster School of Medicine, El Paso, TX, USA
2. Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
3. Division of Pulmonary, Critical Care, and Sleep Medicine, University of California San Diego (UCSD), La Jolla, CA, USA
4. Eastern Vascular Associates, Denville, NJ, USA
5. Johns Hopkins Center for Vascular Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
6. Department of Pulmonary and Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, OH, USA