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The clinical characteristics of the patients (n = 64).
| Age, mean y (SD) | 64 (10) |
| Sex, male, n (%) | 54 (84) |
| Reason for screening endoscopy, n (%) | |
| Previous malignancy | |
| Esophageal cancer | 23 (36) |
| Pharyngeal cancer | 18 (28) |
| Tongue cancer | 9 (14) |
| Laryngeal cancer | 4 (6) |
| Oral cavity cancer | 3 (5) |
| Other | 7 (11) |
