1. Departments of Paediatrics (M.C., M.M.v.W., H.A.D.-v.d.W.), Institute for Clinical and Experimental Neuroscience, VU University Medical Center, 1081 HV Amsterdam, The Netherlands
2. Department of Radiology (J.C.R.), Institute for Clinical and Experimental Neuroscience, VU University Medical Center, 1081 HV Amsterdam, The Netherlands
3. Department of Obstetrics and Gynaecology (J.P.W.V.), Institute for Clinical and Experimental Neuroscience, VU University Medical Center, 1081 HV Amsterdam, The Netherlands
4. Department of Epidemiology (F.E.v.L.), Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands