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Characteristics of patients
| Characteristics | |
| Sex (male/female), no. | 31/24 |
| Age (yr) | 72.56 ± 10.67 |
| BMI (kg/m2) | 24.42 ± 72.56 |
| Comorbidity, n (%) | 35 (66.04) |
| ASA score, n | |
| I | 8 |
| II | 19 |
| III | 28 |
| IV | 0 |
| Tumor location, n | |
| Lower third | 12 |
| Middle third | 30 |
| Upper third | 13 |
