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| addiction (1) |
| adolescent (1) |
| behavior (1) |
| Bundesrepublik Deutschland (1) |
| Federal Republic of Germany (1) |
| gambling (1) |
| Glücksspiel (1) |
| Jugendlicher (1) |
| Nordrhein-Westfalen (1) |
| North Rhine-Westphalia (1) |