Liddle, Rodger A., et al. “Cholecystokinin bioactivity in human plasma. Molecular forms, responses to feeding, and relationship to gallbladder contraction.” Journal of Clinical Investigation 75.4 (1985): 1144.
Stampfer, Meir J., et al. “Risk of symptomatic gallstones in women with severe obesity.” The American journal of clinical nutrition 55.3 (1992): 652-658.