1. Department of Otolaryngology-Head and Neck Surgery; University of Arkansas for Medical Sciences, Little Rock; Arkansas
2. Arkansas Children's Hospital; Little Rock Arkansas U.S.A
3. Department of Pediatrics; Division of Allergy and Immunology, University of Arkansas for Medical Sciences, Little Rock; Arkansas
4. Department of Pediatrics; Division of Biostatistics, University of Arkansas for Medical Sciences, Little Rock; Arkansas