Mepolizumab improvements in health-related quality of life and disease symptoms in a patient population with very severe chronic rhinosinusitis with nasal polyps: psychometric and... oleh Wytske Fokkens, Andrew Trigg, Stella E. Lee, Robert H. Chan, Zuzana Diamant, Claire Hopkins, Peter Howarth, Valerie Lund, Bhabita Mayer, Ana R. Sousa, Steve Yancey, Maggie Tabberer, SYNAPSE study group