Metaanalysis of the efficacy of sublingual immunotherapy in the treatment of allergic asthma in pediatric patients, 3 to 18 years of age - Penagos, M; Passalacqua, G; Compalati, E; Baena-Cagnani, C E; Orozco, S; Pedroza, A; Canonica, G W (Chest, 2008)