Text and Data Mining valid from 2018-12-19
Received: 13 June 2018
Revised: 15 November 2018
Accepted: 19 November 2018
First Online: 19 December 2018
: The authors declare no competing interests.
: The institutional review boards of the Netherlands Organization for Applied Scientific Research TNO (Zeist) and Maastricht University (Maastricht) approved the NLCS. The NLCS was conducted in accordance with the Declaration of Helsinki. By completing and returning the baseline questionnaire, participants agreed to participate in the NLCS.
: This work is published under the standard license to publish agreement. After 12 months the work will become freely available and the license terms will switch to a Creative Commons Attribution 4.0 International licence (CC BY 4.0).