Funding for this research was provided by:
Received: 29 January 2018
Accepted: 15 November 2018
First Online: 28 November 2018
Compliance with ethical standards
: No funding was received for this study.
: Ulrika Björeland, Magnus Alm, Lars Beckman and Camilla Thellenberg-Karlsson declare that they have no conflict of interest. Joakim Jonsson and Tufve Nyholm are shareholders in NONPI Medical AB.
: All human studies have been approved by the appropriate ethics committee and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. All persons gave their informed consent prior to their inclusion in the study.The study was approved by the regional ethical committee (dnr. 2013-3-31 M).
: Informed consent was obtained from all individual participants included in the study.