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| Author | Year | Total divided RYGB (open+laparoscopic ) | GFF | Incidence Rate (%) |
| Cucchi et al. | 1995 | 100 | 6 | 6 |
| Maclean et al. | 1997 | 123 | 4 | 3 |
| Corrodeguas et al. | 2005 | 1292 | 15 | 1.2 |
| Gumbs et al. | 2006 | 282 | 5 | 1.8 |
| Tucker et al. | 2007 | 1763 | 27 | 1.5 |
| Salimath et al. | 2009 | 1796 | 20 | 1.1 |
| Yao et al. | 2010 | 366 | 0 | 0 |
| Ribeiro-parenti et al. | 2017 | 1900 | 9 | 0.5 |
| Chahine et al. | 2018 | 1273 | 15 | 1.8 |
