4. Tsai CJ, Leitzmann MF, Willett WC, Giovannucci EL. Dietary carbohydrates and glycaemic load and the incidence of symptomatic gall stone disease in men. Gut. 2005;54(6):823-828
5. Tsai CJ, Leitzmann MF, Willett WC, Giovannucci EL. Glycemic load, glycemic index, and carbohydrate intake in relation to risk of cholecystectomy in women. Gastroenterology. 2005;129(1):105-112
6. Comparison of the Elemental Content of 3 Sources of Edible Sugar-Analyzed by PCA-TAL, Sept. 11, 2000., (MI Secretaria et al 2003) in parts per million (ppm or mg/li).