MOESM1 of Allergen immunotherapy for allergic asthma: protocol for a systematic review DhamiSangeeta NurmatovUlugbek AgacheIoana LauSusanne MuraroAntonella JutelMarek RobertsGraham AkdisCezmi BoniniMatteo CalderonMoises CasaleThomas CavkaytarOzlem CoxLinda DemolyPascal FloodBreda HamelmannEckard IzuharaKenji KalayciÖmer Kleine-TebbeJörg NietoAntonio PapadopoulosNikolaos PfaarOliver RosenwasserLanny RyanDermot Schmidt-WeberCarsten SzeflerStan WahnUlrich WijkRoy-Gerth WilkinsonJamie SheikhAziz 2016 Additional file 1: Appendix S1. Search strategy.