- The effect of erythromycin on bile excretion and proximal small bowel motility following divided gastric bypass surgery: a prospective randomized placebo-controlled trial. Wilkinson, N.W., Gustafson, R.J., Frizzi, J.D. Obesity surgery : the official journal of the American Society for Bariatric Surgery and of the Obesity Surgery Society of Australia and New Zealand. (2002)