Schulpen, Maya http://orcid.org/0000-0001-7653-0778
van den Brandt, Piet A. http://orcid.org/0000-0001-8781-8099
Funding for this research was provided by:
World Cancer Research Fund (2015/1390)
Maastricht University
Article History
Received: 13 May 2019
Accepted: 3 August 2019
First Online: 7 September 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Individuals invited to participate in the NLCS received an invitation letter with details on the study and they received the baseline questionnaire, which included an envelope for returning toenail clippings alongside with the questionnaire. Individuals agreed to participate in the NLCS by means of returning the baseline questionnaire (response rate 35.5%).