20.Cnattingius S, Signorello LB, Annerén G, et al. Caffeine intake and the risk of first-trimester spontaneous abortion. N Engl J Med. 2000 Dec 21;343(25):1839-45. http://www.ncbi.nlm.nih.gov/pubmed/11117975
21.Jarosz M, Wierzejska R, Siuba M. Maternal caffeine intake and its effect on pregnancy outcomes. Eur J Obstet Gynecol Reprod Biol. 2012 Feb;160(2):156-60. http://www.ncbi.nlm.nih.gov/pubmed/22142815
22.Moisey LL, Kacker S, Bickerton AC, Robinson LE, Graham TE. Caffeinated coffee consumption impairs blood glucose homeostasis in response to high and low glycemic index meals in healthy men. Am J Clin Nutr. 2008 May;87(5):1254-61. http://www.ncbi.nlm.nih.gov/pubmed/18469247