Received: 29 September 2017
Revised: 26 March 2018
Accepted: 16 April 2018
First Online: 6 June 2018
: The authors declare no competing interests.
: The NORDIC-VII study (ExternalRef removed) was approved by the National Ethics Committees and governmental authorities in each country and conducted in accordance with the Declaration of Helsinki. Prognostic biomarker substudies were part of the protocol. All patients gave written informed consent to participate in the study.
: The datasets generated during and/or analysed during the current study are not publicly available but are available from the corresponding author on reasonable request.