Funding for this research was provided by:
Swedish cancer society (CAN 2017/348)
Text and Data Mining valid from 2020-01-16
Received: 14 June 2019
Accepted: 2 December 2019
First Online: 16 January 2020
Compliance with ethical standards
: The authors declare that they have no competing interests.
: All procedures performed in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments, or comparable ethical standards. The study was approved by the local ethics committee, Regionala etikprövningsnämnden (EPN), in Uppsala, Sweden.
: The need for informed consent was waived by the local ethics committee.