23.Pizziol A, Tikhonoff V, Paleari CD, et al. Effects of caffeine on glucose tolerance: a placebo-controlled study. Eur J Clin Nutr 1998 Nov;52(11):846-9. http://www.ncbi.nlm.nih.gov/pubmed/9846599
24.Song F, Qureshi AA, Han J. Increased caffeine intake is associated with reduced risk of basal cell carcinoma of the skin. Cancer Res. 2012 Jul 1;72(13):3282-9. http://www.ncbi.nlm.nih.gov/pubmed/22752299
25.Ragucci KR, Shrader SP. Osteoporosis treatment: an evidence-based approach. J Gerontol Nurs. 2011 Jul;37(7):17-22. http://www.ncbi.nlm.nih.gov/pubmed/21667891
26.Shirlow MJ, Mathers CD. A study of caffeine consumption and symptoms; indigestion, palpitations, tremor, headache and insomnia. Int J Epidemiol. 1985 Jun;14(2):239-48. http://www.ncbi.nlm.nih.gov/pubmed/3874838