1. Tulane University, School of Public Health & Tropical Medicine, Department of Global Environmental Health Science, New Orleans, LA, USA
2. University of Vermont, Medical Biostatistics Unit, Larner College of Medicine, Burlington, VT, USA
3. Glenn Consulting Group, LLC, Seabrook Island, SC, USA
4. West Virginia University, School of Medicine, Section of Pulmonary and Critical Care, Morgantown, WV, USA