Table 2. Distribution of participants by follow-up center location.
| Number | Percent | ||
| Follow-up center | South | 62 | 22.4% |
| Middle | 73 | 26.4% | |
| North | 50 | 18.1% | |
| Eastern | 66 | 23.8% | |
| Others | 26 | 9.4% | |
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