Funding for this research was provided by:
Danish Centre for Nanosafety II (not applicable)
Text and Data Mining valid from 2019-06-11
Received: 25 February 2019
Accepted: 16 May 2019
First Online: 11 June 2019
Ethics approval and consent to participate
: The Danish Committee on Health Research Ethics of the Capital Region approved the study (H-16033227). All study participants were given both oral and written information and provided written consent before enrolment.
: Not applicable.
: The authors declare that they have no competing interests.