1. National Perinatal Epidemiology Centre; Cork University Maternity Hospital; Cork Ireland
2. The Irish Centre for Fetal and Neonatal Translational Research; Cork University Maternity Hospital; Cork Ireland
3. Department of Epidemiology and Public Health; University College Cork; Cork Ireland
4. National Centre for Register-based Research; Aarhus University; Aarhus Denmark
5. Centre for Integrated Register-based Research; Aarhus University; Aarhus Denmark
6. Perinatal Epidemiology Research Unit; Department of Paediatrics; Aarhus University Hospital; Skejby Aarhus N Denmark