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Article History

Received: 12 October 2017

Accepted: 6 February 2018

First Online: 15 February 2018

Competing Interests

: MvP is a co-founder of Clinical Science Systems, Leiden, the Netherlands. Clinical Science Systems was not involved in this study. MA reports options from Brain Resource (Sydney, Australia); is director and owner of Research Institute Brainclinics, a minority shareholder in neuroCare Group (Munich, Germany), and a co-inventor on 4 patent applications (A61B5/0402; US2007/0299323, A1; WO2010/139361 A1; WO2017/099603 A1) related to EEG, neuromodulation and psychophysiology, but does not own these nor receives any proceeds related to these patents.