Threshold values of grass pollen (Poaceae) concentrations and increase in emergency department visits, hospital admissions, drug consumption and allergic symptoms in patients with allergic rhinitis: a systematic review

Jana Becker; Nadine Steckling-Muschack; Isabella Mittermeier; Karl-Christian Bergmann; Stephan Böse-O’Reilly; Jeroen Buters; Athanasios Damialis; Katharina Heigl; Joachim Heinrich; Michael Kabesch; Hanna Mertes; Dennis Nowak; Paul Schutzmeier; Sandra Walser-Reichenbach; Alisa Weinberger; Christine Korbely; Caroline Herr; Stefanie Heinze; Susanne Kutzora