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Number of operated patients, patients still alive at follow up, and patients who completed the questionnaire at follow up, by year of surgery
| Year of surgery | Total No of patients included | Still alive | Completed questionnaire |
| 1995 | 49 | 27 (55.1%) | 24 |
| 1996 | 45 | 30 (66.7%) | 23 |
| 1997 | 49 | 40 (81.6%) | 34 |
| 1998 | 73 | 56 (76.7%) | 51 |
| 1999 | 93 | 80 (86.0%) | 66 |
| 2000 | 83 | 75 (90.4%) | 63 |
| 2001 | 98 | 93 (94.9%) | 83 |
| 2002 | 125 | 122 (97.6%) | 101 |
| Total during period | 615 | 523 (85.0%) | 445 (72.4%) |
