Placebo in sports nutrition: a proof-of-principle study involving caffeine supplementation - Saunders, B; Oliveira, L. F. de; Silva, R. P. da; Painelli, V. de Salles; Gonçalves, L. S; Yamaguchi, G; Mutti, T; Maciel, E; Roschel, Hamilton; Artioli, G. G; Gualano, Bruno (Scandinavian Journal of Medicine & Science in Sports, 2017)