Funding for this research was provided by:
Ministerie van Volksgezondheid, Welzijn en Sport (326523)
Received: 21 February 2020
Accepted: 18 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: The present study was conducted according to the principles of the Declaration of Helsinki. This study was classified as not being subject to the rules laid down in the Medical Research Involving Human Subjects Act (also known by its Dutch abbreviation WMO) by the Medical Ethics Committee (MEC) of the Erasmus Medical Centre Rotterdam, which means that no further ethical approval was required as the study was retrospective and did not involve disclosure of any patient information and privacy (MEC-2018-2216).
: Not applicable.
: The authors have declared that no competing interests exist. LO is an Editorial Board member for BMC Public Health, but had no role in the editorial process.