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The demographic characteristics of the cohorts
| Outpatients who had visited our clinic from January 2007 to March 2007 |
| ↓ |
| Obtained informed consents |
| ↓ |
| Performed routine ophthalmological examinations |
| ↓ |
| Performed OCT measurements for patients fitted with the criteria |
| ↓ |
| Recruited them in this study (Excluded patients with the abnormal or the error OCT findings) |
