INS and diabetes mellitus: Two years after surgery, 1,990 patients (23.4%) received pharmacological treatment for diabetes: 1,328 received oral medical treatment alone for diabetes (15.6%), 228 received insulin alone (2.7%), 19 received a GLP-1 analogue alone (0.2%), and 415 received a combination of oral treatment and insulin (4.9%).The remaining 6,499 did not receive medical treatment for diabetes 2 years after surgery (76.6%).