Acknowledgements

The medical writing of this review was funded by Allergopharma GmbH & Co. KG, Reinbek, Germany. We gratefully acknowledge the medical writing support of Katrin Engemann (SPM PharmaBusiness, Hamburg, Germany) and we thank Susanne Thum-Oltmer, Sabine Mussler, Kristina Duwensee and Lutz Lauenstein (all employees of Allergopharma GmbH & Co. KG) for scientific discussions, helpful comments on the concept of this review and editorial assistance.