Funding for this research was provided by:
Social Insurance Institution of Finland (37/26/2011 and 31/26/2015)
Tampere University Hospital (9R015, 9S017, 9T015, and 9U017)
Received: 27 February 2019
Accepted: 12 June 2019
First Online: 13 July 2019
Ethics approval and consent to participate
: The participants gave their informed consent at their first visit to the research centre (i.e. at the baseline measurement of the study), and the trial was conducted according to the Declaration of Helsinki. The study was approved by the Ethics Committee of Pirkanmaa Hospital District, Finland (ETL code R08157).
: The individual depicted in the images in Additional file InternalRef removed. provided her written informed consent for the publication of these identifiable images.
: The authors declare that they have no competing interests.