1. Department of Psychiatry and Neurology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3125, Japan
2. Osaka-Hamamatsu Joint Research Centre for Child Mental Development, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu, Shizuoka 431-3125, Japan
3. Osaka-Hamamatsu Joint Research Centre for Child Mental Development, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3125, Japan, and Institute of Psychiatry, King's College, London, UK
4. Institute of Psychiatry, King's College, London, UK