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Contributors The study was designed by TW, FE and KT. Data collection was performed by TW, FE, AS and HMO. Data analysis was performed by TW and FE. All authors critically revised the manuscript and approved of the final version.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Not required.
Ethics approval The study was approved by the Lund University regional ethics board (Dnr:2016/1068).
Provenance and peer review Not commissioned; externally peer reviewed.