Funding for this research was provided by:
H2020 European Research Council (687905, 679820)
Received: 16 November 2018
Accepted: 5 March 2019
First Online: 11 April 2019
Ethics approval and consent to participate
: The study was approved by the Swedish regional ethical committee in Gothenburg.
: All participating subjects signed informed consent for this study and its publication.
: EM and MOC were partially funded by and RB is board member of Integrum AB, which owns a patent on the e-OPRA technology.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.