1. Department of Psychotherapy and Psychosomatic Medicine, Faculty of Medicine of the TU Dresden, Germany
2. Department for Infant Mental Health, Regional Centre for Child and Adolescent Mental Health, Eastern and Southern Norway, Oslo, Norway
3. Institute of Clinical Medicine, Campus Ahus, University of Oslo, Lørenskog, Norway
4. HØKH, Research Centre, Akershus University Hospital, Norway
5. Department of Child Health and Development, Norwegian Institute of Public Health, Oslo, Norway