Wikoff D, Doepker C, Welsh B, Urban J, Henderson R, Brorby G, Britt J, Harvey S, et al. 2015. Systematic review of the adverse cardiovascular effects of caffeine consumption in healthy adults, pregnant women, adolescents, and children. PROSPERO 2015:CRD42015026673. Available from https://www.crd.york.ac.uk/PROSPERO/view/CRD42015026673 (Systematic Review Protocol Registration)