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Article History

Received: 20 June 2018

Accepted: 17 December 2018

First Online: 11 January 2019

Ethics approval and consent to participate

: The study has been approved by the Norwegian Regional Committee for Medical and Health Research Ethics (number 273.06 and 2012/1090–11) and by the Norwegian Centre for Research Data (project number 16001). At baseline in 2008, the patients in the Norwegian LTMV registry in West Norway were contacted by post and asked to participate in the study. In an information letter it was informed that the data would be stored for a possible follow-up study. Consent to participate in the study was considered by returning of the filled out questionnaires. In the follow-up study there was a written consent to allow register connection between the registers. For cohort patients who died, exemption from the consent requirement for register connection to the Norwegian Patient Registry and Cause of Death Register was given from the Regional Committee for Medical and Health Research Ethics.Data from the Norwegian Patient Register has been used in this publication. The interpretation and reporting of these data are the sole responsibility of the authors, and no endorsement by the Norwegian Patient Register is intended nor should be inferred.

: Not applicable.

: No conflicts of interest have been declared by the authors.

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