Xue, Hai
Sveinsson, Olafur
Bartek, Jiri Jr
Förander, Petter
Skyrman, Simon
Kihlström, Lars
Shafiei, Raana
Mathiesen, Tiit
Tomson, Torbjörn
Article History
Received: 27 June 2017
Accepted: 12 December 2017
First Online: 11 January 2018
Compliance with ethical standards
: The study was approved by the ethics committee of Karolinska Institutet.
: The authors report no conflict of interest concerning the materials or methods used in this study or the findings specified in this paper.
: All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge, or beliefs) in the subject matter or materials discussed in this manuscript.
: 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 1964 Helsinki and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.