Sudhin Thayyil1, Paul Bassett2, Seetha Shankaran3. 1. Centre for Perinatal Neuroscience, Imperial College London, London W120HS, UK. Electronic address: s.thayyil@imperial.ac.uk. 2. Statsconsultancy, Amersham, London, UK. 3. Neonatal-Perinatal Medicine, Wayne State University, Detroit, MI, USA.