Vala, C. H. http://orcid.org/0000-0001-8932-9686
Lorentzon, M.
Sundh, V.
Johansson, H.
Lewerin, C.
Sten, S.
Karlsson, M.
Ohlsson, C.
Johansson, B.
Kanis, J. A.
Mellström, D.
Funding for this research was provided by:
ALF/LUA (ALFGBG722321, ALFGBG437971)
Vetenskapsrådet (2017-02229)
Article History
Received: 9 July 2019
Accepted: 19 November 2019
First Online: 12 December 2019
Compliance with ethical standards
:
: None.
: 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. For this study, we received de-identified data registers from the Statistics Sweden. Ethical approval was granted by the regional ethics committee in Lund, Sweden (LU 630-99). Since this is a retrospective study, formal consent was not needed.