German asthma net: Nasal polyposis in patients in the severe asthma registry. - Bal C; Stoshikj S; Milger K; Skowasch D; Gappa M; Koerner-Rettberg C; Jandl M; Schmidt O; Ehmann R; Taube C; Hamelmann E; Buhl R; et al. (Allergy, 2024)