1. Madis Parksepp, Department of Psychiatry, University of Tartu, Tartu, Estonia;
2. Ülle Ljubajev, Department of Psychiatry, University of Tartu, Tartu, Estonia;
3. Karin Täht, Institute of Psychology, University of Tartu, Tartu, Estonia;
4. Sven Janno, Department of Psychiatry, University of Tartu, Tartu, Estonia