“Cognitive effects of anodal transcranial direct current stimulation and high-dose cocoa flavonoids on an acutely sleep-deprived, highly educated population: a proposed single-center, phase II, randomized, placebo-controlled, double-blind, factorial study” (2018) Principles and Practice of Clinical Research, 4(1), pp. 27–35. Available at: https://journal.ppcr.org/index.php/ppcrjournal/article/view/63 (Accessed: 24 November 2024).