1Autism Research Centre, Department of Psychiatry, University of Cambridge, Douglas House, 18B Trumpington Rd, Cambridge, CB2 8AH, UK
2Neonatal Service, Rosie Maternity Hospital, Robinson Way, Cambridge, CB2 0QQ, UK
3Department of Clinical Biochemistry, Addenbrooke’s Hospital, Cambridge, CB2 0QQ, UK
4Department of Fetal Medicine, Rosie Maternity Hospital, Robinson Way, Cambridge, CB2 0QQ, UK
5Douglas Mental Health University Institute, McGill University, Montreal, QC, Canada