Funding for this research was provided by:
The Swedish Research Council for Health, Working Life and Welfare
Received: 5 December 2018
Revised: 5 March 2019
Accepted: 25 March 2019
First Online: 8 April 2019
Compliance with ethical standards
: LFC and DM-C receive royalties for contributing articles to UpToDate, Wolters Kluwer Health. HL has served as a speaker for Evolan and Shire and has received research grants from Shire, all outside of the submitted work. The remaining authors declare that they have no conflict of interest.