1 Department of Epidemiology, Human Genetics & Environmental Health, University of Texas School of Public Health, Health Science Center, Dallas Campus, Dallas, Texas.
2 Center for Pediatric Population Health, Children's Health System of Texas and University of Texas Health Science Center, Dallas, Texas.
3 Division of Respiratory Medicine, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas.
4 Department of Epidemiology, Human Genetics & Environmental Health, University of Texas School of Public Health, Health Sciences Center at Houston, Austin Campus, Austin, Texas.
5 School of Nursing and Health Sciences, University of Miami School of Nursing, Miami, Florida.