[1] Univ Med Sci, Chair & Dept Med Genet, Poznan, Poland
[2] St Georges Univ London, Populat Hlth Res Inst, London, England
[3] Newcastle Univ, Fac Med Sci, Populat Hlth Sci Inst, Newcastle Upon Tyne, Tyne & Wear, England
[4] Univ Zagreb, Childrens Hosp Zagreb, Ctr Excellence Reprod & Regenerat Med, Med Sch, Zagreb, Croatia
[5] Fundacio Foment Invest Sanitaria & Biomed, Rare Dis Res Unit, Valencia, Spain
[6] Prov Inst Hyg, Antwerp, Belgium
[7] Univ Hosp Southern Denmark, Lillebaelt Hosp, Dept Paediat & Adolescent Med, Kolding, Denmark
[8] Natl Hlth Inst Doutor Ricardo Jorge, Dept Epidemiol, Lisbon, Portugal
[9] Univ Med Ctr Groningen, Dept Genet, Groningen, Netherlands
[10] Natl Inst Hlth, Dept Epidemiol, Lisbon, Portugal
[11] Univ Ferrara, IMER Registry Emilia Romagna Registry Birth Defec, Ferrara, Italy
[12] Azienda Osped Univ Ferrara, Ferrara, Italy
[13] Otto von Guericke Univ, Malformat Monitoring Ctr Saxony Anhalt, Med Fac, Magdeburg, Germany
[14] Inst Clin Physiol, Unit Epidemiol Rare Dis & Congenital Anomalies, Pisa, Italy