Burkhard Tümmler1. 1. Clinical Research Group 'Molecular Pathology of Cystic Fibrosis', Clinic for Paediatric Pneumology, Allergology and Neonatology, OE 6710, Hannover Medical School, Hannover, Germany; Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research, Hannover, Germany. Electronic address: tuemmler.burkhard@mh-hannover.de.