R. M. van Dam, et al. Coffee consumption and risk of type 2 diabetes mellitus. Lancet 2002; 360:1477-1478.
R. M. van Dam and F. B. Hu. Coffee consumption and risk of type 2 diabetes: a systematic review. JAMA 2005; 294:97-104.
R. Huxley, et al. Coffee, decaffeinated coffee, and tea consumption in relation to incident type 2 diabetes mellitus: a systematic review with meta-analysis. Arch Intern Med 2009; 169:2053-2063.
T. MacKenzier, et al. Metabolic and hormonal effects of caffeine: randomized, double-blind, placebo-controlled crossover trial. Metabolism 2007;56:1694-1698.