Text and Data Mining valid from 2019-05-06
Received: 27 February 2019
Accepted: 15 April 2019
First Online: 6 May 2019
Ethics approval and consent to participate
: Ethical approval according to the Medical Research (Human Subjects) Act (WMO), formal approval for this research project by a medical ethics committee was not required. The NIVEL Primary Care Database extracts data according to strict guidelines for the privacy protection of patients and GPs. In addition, we sought and obtained permission for this work from the board of the NIVEL network.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.