Use of hierarchical models to analyse European trends in congenital anomaly prevalence by Cavadino, A, Prieto-Merino, D, Addor, M, Arriola, L, Draper, E, Garne, E, Greenlees, R, Haeusler, M, Khoshnood, B, Kurinczuk, J, McDonnell, B, Nelen, V, O'Mahoney, M, Randrianaivo, H, Rankin, J, Rissman, A, Tucker, D, Verrelen-Dumouli, C, de Walle, H, Wellesley, D, Morris, J, Bianchi, F