1. Biomedical Research Institute; Pontificia Universidade Católica do Rio Grande do Sul; Porto Alegre; Brazil
2. University Children's Hospital; Technical University Dresden; Dresden; Germany
3. Research Institute for the Prevention of Allergic Diseases; Children's Department; Marien-Hospital; Wesel; Germany
4. Department of Experimental Pneumology; Ruhr-University; Bochum; Germany
5. University Children's Hospital; Albert Ludwigs University; Freiburg; Germany
6. Kinder- und Jugendarztpraxis Laub; Rosenheim; Germany
7. Children's Department; University Teaching Hospital; Landeskrankenhaus Feldkirch; Feldkirch; Austria
8. University Children's Hospital Vienna; Vienna; Austria
9. Institute of Epidemiology and Medical Biometry; Ulm University; Ulm; Germany