| Authors | Average Age of presentation | Right | Left | Bilateral |
1. | Mufti (1988) [14] | NR | 34 | 44 | 0 |
2. | Al-Umran et al. (1988) [15] | 1 day | 29 | 52 | 37 |
3. | Khan and Banjamin (1992) [16] | 1 day | 9 | 46 | 26 |
4. | Mirdad (2002) [17] | NR | 67 | 82 | 127 |
5. | Kremli (2003) [10] | NR | 159 | 223 | 218 |