1. McKusick-Nathans Institute of Genetic Medicine and Cystic Fibrosis Foundation Genotyping Center, Johns Hopkins University School of Medicine, Baltimore and Bethesda, Maryland, and Prague, Czech Republic
2. the Predoctoral Training Program in Human Genetics, Johns Hopkins University School of Medicine, Baltimore and Bethesda, Maryland, and Prague, Czech Republic
3. Division of Otolaryngology Head and Neck Surgery, Uniformed Services University of the Health Sciences, Baltimore and Bethesda, Maryland, and Prague, Czech Republic
4. Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore and Bethesda, Maryland, and Prague, Czech Republic
5. Cystic Fibrosis Center, Institute of Biology and Medical Genetics, Charles University Prague-2 School of Medicine, Baltimore and Bethesda, Maryland, and Prague, Czech Republic