Funding for this research was provided by:
Norske Kvinners Sanitetsforening
Received: 19 November 2017
Accepted: 10 September 2019
First Online: 17 September 2019
Ethics approval and consent to participate
: All participants have signed a written informed consent declaration prior to inclusion. The Tromsø Study has been approved by the Data Inspectorate of Norway and Regional Committee of Medical and Health Research Ethics, North Norway.
: Not applicable.
: Saija Mikkilä, Giovanna Calogiuri and Nina Emaus have no conflict of interest. Bente Morseth has received lecture fees from Pfizer.