- Geert-Jan Will: Institute of Psychology, Leiden University, 2333 AK Leiden, The Netherlands, Leiden Institute for Brain and Cognition (LIBC), Leiden University Medical Center, 2300 RC Leiden, The Netherlands, and g.j.will@fsw.leidenuniv.nl.
- Eduard T Klapwijk: Leiden Institute for Brain and Cognition (LIBC), Leiden University Medical Center, 2300 RC Leiden, The Netherlands, and Department of Child and Adolescent Psychiatry, Curium-Leiden University Medical Center, 2300 AA Leiden, The Netherlands.