Proportions (i.e. percentage of patients with esophageal dysmotility, patients with ulcerations at the banding/anastomosis site, etc.) will be compared using McNemar test. Continuous parameters (i.e. symptom scores, esophageal manometry and bolus transit data) recorded prior and 3-months after the conversion will be compared using paired T-tests. For statistical significance alpha will be set at 0.05.