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Characteristics of 30 ophthalmologists in the maximum variety sample
| No of ophthalmologists | |
| Gender | |
| Male | 24 |
| Female | 6 |
| Site of practice | |
| Teaching hospital | 9 |
| Private practice | 14 |
| Community hospital | 7 |
| Area | |
| Western Japan | 21 |
| Eastern Japan | 9 |
| Age | |
| Younger than 40 | 11 |
| 40–49 | 13 |
| Older than 50 | 7 |
