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Article History

Received: 21 November 2019

Accepted: 16 December 2019

First Online: 6 January 2020

Ethics approval and consent to participate

: This study was approved from the local ethics committee at Lund University (LU51-90, DNR652/2005). Written informed consent was obtained from all individual participants included in this study.

: Not applicable.

: The authors declare that they have no competing interests.