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| Number of patients (n) | 21 |
| Male (n) | 12 |
| Female (n) | 9 |
| Age (years) (mean ± SD) | 61.76 ± 8.91 |
| Body mass index (kg/cm2) (mean ± SD) | 25.66 ± 4.01 |
| Oral morphine equivalent daily use (mg) [median (minimum - maximum)] | 90 (37-312) |
