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Genuneit, Jon; Büchele, Gisela; Waser, Marco; Kovacs, Katalin; Debinska, Anna; Boznanski, Andrzej; Strunz-Lehner, Christine; Horak, Elisabeth; Cullinan, Paul; Heederik, Dick; Braun-Fahrländer, Charlotte; von Mutius, Erika; GABRIELA Study Group, (2011). The GABRIEL Advanced Surveys: study design, participation and evaluation of bias. Paediatric and perinatal epidemiology, 25(5), pp. 436-47. Oxford: Blackwell Science 10.1111/j.1365-3016.2011.01223.x
