“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”. Principles and Practice of Clinical Research 4, no. 1 (July 25, 2018): 27–35. Accessed November 24, 2024. https://journal.ppcr.org/index.php/ppcrjournal/article/view/63.