During the whole trial, patients will record all types of healthcare resources utilizations (hospitalizations, drug treatments, endoscopic procedures…) while the symptomatic efficacy of the treatment will be assessed by standard questionnaires at the following visits scheduled at 1, 5, 9, 12, 18, 24 months. The glycemic control will be determined at each visit in diabetic patients. A delayed gastric emptying will not be a selection criteria but we have planned to analyze the clinical results of the treatment in taking into account a delayed or normal gastric emptying during the pre-implantation period. Moreover, gastric emptying studies have been scheduled at 5, 9, 12 and 24 months to test the impact of gastric electrical stimulation on gastric emptying.