Correction to: npj Primary Care Respiratory Medicine (2018) https://doi.org/10.1038/s41533-018-0081-y; published online 10 April 2018

The original version of this article contained an error in the spelling of the author Mette Marie Kristensen, which was incorrectly given as Mette-Marie Kristensen. The affiliation details for Mette Marie Kristensen were also incorrect in this Article. The correct affiliation details for this author are given below:

National Institute of Public Health, University of Southern Denmark, Odense, Denmark

This has now been corrected in both the PDF and HTML versions of the Article.