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Bousquet, Jean; Anto, Josep; Sunyer, Jordi; Nieuwenhuijsen, Mark; Vrijheid, Martine; Keil, Thomas; MeDALL; CHICOS; ENRIECO; GA²LEN (2013). Pooling birth cohorts in allergy and asthma: European Union-funded initiatives - a MeDALL, CHICOS, ENRIECO, and GA²LEN joint paper. International Archives of Allergy and Immunology, 161(1):1-10.