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| empirical social research (1) |
| empirische Sozialforschung (1) |
| survey research (1) |
| Telefoninterview (1) |
| telephone interview (1) |
| Umfrageforschung (1) |
| empirical social research (1) |
| empirische Sozialforschung (1) |
| survey research (1) |
| Telefoninterview (1) |
| telephone interview (1) |
| Umfrageforschung (1) |