Table 1. Demographic characteristics.
| Characteristics | Frequency | Percentage |
| Sex | ||
| Male | 19 | 79.2 |
| Female | 5 | 20.8 |
| Age, years | ||
| 20-40 | 7 | 29.2 |
| 41-60 | 11 | 45.8 |
| 61-80 | 6 | 25 |
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