I have some questions about the Radiofrequency Ablation therapy. Has anyone had this procedure done?? The question is: If they eradicate and get rid of the bad tissue that is in the lining of the esophagus, when you go back for post-op check -ups with an edoscopy, how can they tell if the inner walls inside are free of the bad tissue. In other words how deep inside the walls of the esophagus does the procedure treat??