1. Boston College Chestnut Hill Massachusetts USA
2. University of Oslo Oslo Norway
3. University of Minnesota Minneapolis Minnesota USA
4. German Youth Institute Munich Germany
5. German Institute for International Educational Research Frankfurt am Main Germany
6. University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
7. The Norwegian Center for Child Behavioral Development Oslo Norway
8. Utrecht University Utrecht The Netherlands
9. University of Montreal Montreal Quebec Canada
10. University of Bordeaux Bordeaux France