Educational inequalities in self-rated health and emotional exhaustion among workers during the COVID-19 pandemic: a longitudinal study.

"Declarations Conflict of interestAuthors are required to disclose financial or non-financial interests that are directly or indirectly related to the work submitted for publication. Ethical approvalOn the basis of the existing regulations, the TNO Internal Review Board approved the study and assessed the NWCS-COVID-19 cohort study as not being subject to the requirements of the Medical Research (Human Subjects) Act (ID number: 2019–061 for Wave 1; ID number: 2020–057 for Wave 2–4; ID number: 2021–101 for Wave 5). The study followed all recommendations with regard to the privacy aspects including an informed consent, information letter and the possibility to voluntarily discontinue participation in the study. Patient consent for publicationNot required. Conflict of interest Authors are required to disclose financial or non-financial interests that are directly or indirectly related to the work submitted for publication."