Erratum

After publication of the original article [1] it was brought to our attention that the following declaration should be included:

‘The statements presented in this publication are solely the responsibility of the authors and do not necessarily represent the views of the Patient-Centered Outcomes Research Institute (PCORI), its Board of Governors or Methodology Committee’.

Also, author Joann Sorra was incorrectly included as Joanna Sorra. The correct spelling of Joann Sorra’s name is included in the author list of this erratum.