| Affiliation: | 1. Department of Health Services Research and Administration, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska;2. Department of Biostatistics, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska;3. Department of Biostatistics, School of Public Health, University of Texas Health Science Center at Houston, Austin Regional Campus, Austin, Texas;4. Department of Physiological and Technological Nursing, College of Nursing, Augusta University, Augusta, Georgia;5. Department of Geography, University of Utah, Salt Lake City, Utah |
