I-STEP Study app is for data capture for the GI Dynamics Clinical Trial. The study is a Randomized, Multi-Center, Pivotal Efficacy and Safety Study Evaluating the EndoBarrier® System for Glycemic Improvement in Patients with Inadequately Controlled Type 2 Diabetes and Obesity. Medable use Apple's ResearchKit library to gather information from participants throughout their participation in the study. Medable does not use any HealthKit functionality for this study.