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Article History

First Online: 29 May 2019

Compliance with Ethical Standards

:

: This work was supported by the Dutch Organization for Health Research and Development (ZonMW) [dossier number: 60-00635-98-140]. The funding source had no involvement in the collection, analysis and interpretation of data; in the writing of the report; or in the decision to submit the article for publication.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: Informed consent was obtained from all individual participants included in the study.

: The authors declare that they have no conflict of interest.