1. Cystic Fibrosis Center for Children and Adults, Brandenburg Medical School (MHB) University, Klinikum Westbrandenburg, Brandenburg an der Havel, Germany
2. Center for Investigation in Pediatrics, School of Medical Sciences, University of Campinas, Campinas, São Paulo, Brazil
3. Faculty of Health Sciences, joint Faculty of the Brandenburg University of Technology Cottbus-Senftenberg, The Brandenburg Medical School Theodor Fontane and the University of Potsdam, Germany