Table 3: Excluded studies and reasons for exclusion.
| Estudio (referencia bibliográfica) | Razones de exclusión |
| Cooper [10] | Does not meet inclusion criteria |
| Costa [11] | Does not meet inclusion criteria |
| Dodson [12] | Does not meet inclusion criteria |
| Henry [9] | Does not answer the question |
| Khan [13] | Does not meet inclusion criteria |
| Khan [5] | Does not meet inclusion criteria |
| Khan [14] | Does not meet inclusion criteria |
| Zavras [15] | Editorial |
| Xue [16] | Does not meet inclusion criteria |