INS and diabetes mellitus: Type 2 diabetes age of 33 patients who were using insulin were 39.42 ± 15.52 months, 35 patients who used oral antidiabetic medicine were 20.2 ± 9.26 months and 20 patients who were started to use oral antidiabetic drugs during preoperative assessment were 9.6 ± 3.34 months (diabetes age was calculated from the diagnose date to the operation date, it takes about 6–18 months to have an operation appointment in our clinic).