| Author | Year | No. of patients | Followup (mean) | Success rate % |
| Chilton et al. [10] | 1983 | 151 | 5 yr | 50 |
| Holm Nielsen et al. [20] | 1984 | 225 | Not specified | 77 |
| Albers et al. [21] | 1992 | 937 | 3.9 yr | 62 |
| Pansadoro et al. [13] | 1996 | 224 | 8 yr | 32 |
| Steenkamp et al. [22] | 1997 | 101 | 14.4 mo | 77 |
| Santucci et al. [23] | 2010 | 74 | 14 mo | 8 |
| Present study | 2018 | 75 | 6 mo | 69.3 |