Text and Data Mining valid from 2019-04-29
Received: 21 August 2018
Accepted: 15 April 2019
First Online: 29 April 2019
Ethics approval and consent to participate
: The Regional Ethical Board in Umeå, Sweden, approved the study. We invited people to the study by sending them a questionnaire with an accompanying letter. In the letter, information was provided about the register data that would be used in addition to questionnaire responses. Participants consented to participate in the study when they returned their questionnaires (without explicitly responding to a question).
: Not applicable.
: FN is Associate Editor at BMC Public Health. The authors declare that they have no other competing interests.
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