Funding for this research was provided by:
Polar Electro Oy
Article History
Received: 4 July 2018
Accepted: 16 March 2019
First Online: 19 April 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in this study were in accordance with the ethical standards of the cantonal ethics committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.