Article History
Received: 18 December 2017
Accepted: 26 April 2018
First Online: 8 May 2018
Competing Interests
: We have the following interests. The iPhysioMeter<sup>SM</sup> app, distributed for free in the iTunes App Store (Apple, Inc.) and used in this study, was developed by two of the authors of the present paper (K.M. and T.Y.). One of the co-authors (P.R.) currently serves as Director of Science and Technology of Oxford BioHorizons Ltd., a consultancy company, and as a grant review committee member of the European Commission. There are no further patents, products in development or marketed products to declare.