Article History
Received: 20 November 2017
Accepted: 4 December 2018
First Online: 18 December 2018
Compliance with ethical guidelines
:
: P. Bhogal, L.L. Yeo and M. Söderman declare that they have no competing interests.
: Ethics committee approval was not required for this publication. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study