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| Reference | Study interval | N | Histology |
|---|---|---|---|
| Swisher et al. (12) | 1987-2000 | 13 | SCCA/ACA |
| Nakamura et al. (13) | 1992-2002 | 27 | SCCA |
| Tomimaru et al. (14) | 1985-2004 | 24 | SCCA |
| Chao et al. (15) | 1997-2004 | 27 | SCCA |
| Oki et al. (16) | 1994-2005 | 14 | SCCA |
| Borghesi et al. (17) | 1999-2005 | 10 | SCCA/ACA |
| Nishimura et al. (18) | 2000-2006 | 46 | SCCA |
| Marks et al. (19) | 1997-2010 | 65 | ACA |
