Table 1.
Types and number of references included in this review article
| Content | Study design | Number of studies included | Total number of patients |
|---|---|---|---|
| Cytology | Experimental | 22 | |
| Prospective | 8 | 392 | |
| Retrospective | 19 | 1561 | |
| Review article | 3 | ||
| Case report | 2 |
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