@article{article6bf013da,
title   = {Polarity- and valence-dependent effects of prefrontal transcranial direct current stimulation on heart rate variability and salivary cortisol},
author = {Brunoni, André Russowsky and Vanderhasselt, Marie-Anne and Boggio, Paulo S and Fregni, Felipe and Dantas, Eduardo Miranda and Mill, José G and Lotufo, Paulo Andrade and Benseñor, Isabela Judith Martins},
year = {2013},
doi = {10.1016/j.psyneuen.2012.04.020},
journal   = {Psychoneuroendocrinology}
}