1 School of Public Health, University College Cork, Cork, Ireland.
2 School of Public Health, University College Cork, Cork, Ireland; INFANT Research Centre, University College Cork, Cork, Ireland.
3 INFANT Research Centre, University College Cork, Cork, Ireland; Department of Obstetrics and Gynaecology, Cork University Maternity Hospital, Cork, Ireland.
4 Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland.
5 School of Public Health, University College Cork, Cork, Ireland; Mohammed Al-Mana College for Medical Sciences, Saudi Arabia.
6 School of Public Health, University College Cork, Cork, Ireland; INFANT Research Centre, University College Cork, Cork, Ireland. Electronic address: gillian.maher@ucc.ie.