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Article History

Received: 7 April 2017

Accepted: 19 March 2018

First Online: 3 April 2018

Ethics approval and consent to participate

: The ANH database is run according to Dutch privacy legislation and contains pseudonymized general practice care data from all patients of the participating general practices, excluding those patients who object to this. Observational studies based on anonymized data from the ANH VUmc database are exempted from informed consent of patients. Permissions were sought and granted to access the ANH VUmc database.

: Not applicable.

: The authors declare that they have no competing interests.

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