<qa>  What type of procedure can subjects with severe esophagitis continue to study without performing- Contra-indication to the BravoTM procedure such as subjects with a history of bleeding diathesis, strictures anywhere along the GI-tract, esophageal varices, obstructions, or subjects equipped with a pacemaker, an implantable cardiac defibrillator or an implantable neurostimulator NB: subjects with severe esophagitis grade D confirmed by endoscopy at Visit 2 can continue the study without performing the BravoTM procedure 