1. School of Nursing West Virginia University Morgantown West Virginia USA
2. West Virginia University Hospital Morgantown West Virginia USA
3. Department of Biostatistics School of Public Health West Virginia University Morgantown West Virginia USA
4. Section of Pulmonary, Critical Care, and Sleep Medicine, School of Medicine West Virginia University Morgantown West Virginia USA
5. Department of Epidemiology School of Public Health West Virginia University Morgantown West Virginia USA
6. School of Nursing University of Kansas Medical Center Kansas City Kansas USA
7. School of Preventive Medicine University of Kansas Medical Center Kansas City Kansas USA