[1] Univ Bristol, Neonatal Neurol Grp, Bristol, Avon, England
[2] Univ Bristol, Stem Cells & Neurodegenerat Res Grp, Bristol, Avon, England
[3] North Bristol NHS Trust, Neonatal Intens Care Unit, Bristol, Avon, England
[4] Univ Bristol, Neonatal Neurosci Grp, Bristol, Avon, England