Funding for this research was provided by:
Jane ja Aatos Erkon Säätiö (Keeping eggs healthy)
Svenska Forskningsrådet Formas (EDC2020)
Received: 9 October 2019
Accepted: 11 May 2020
First Online: 15 June 2020
Ethics approval and consent to participate
: The SELMA study has been approved by the Uppsala regional ethical committee (Dnr. 2007/062, 2015/177)). Participants provided their written consent in accordance with the Helsinki Declaration.
: Not applicable.
: The authors declare that they have no competing interests.