Funding for this research was provided by:
Swedish Breast Cancer Association
Article History
Received: 14 September 2019
Accepted: 8 November 2019
First Online: 18 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The original study was approved by the Ethics Review Board at Karolinska Institutet, Stockholm, in 2014 (2014/2106-31/1) with an amendment in order to update and complete the original database in 2016 (2016/373-32). 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 declaration and its later amendments or comparable ethical standards.
: The Ethical Review Board at Karolinska Institutet determined that individual informed consent was not required for this type of study.