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Article History

First Online: 11 September 2019

Compliance with Ethical Standards

:

: The study was funded by the WHO Regional Office for Europe’s Health Technologies and Pharmaceuticals programme. No funding was received for the writing of the manuscript.

: SV, GD and HBP have no conflicts of interest to declare. All authors submitted a signed Conflict of Interest disclosure form.

: All authors fulfil the authorship criteria. All authors are aware of the submission and are in agreement with the manuscript. SV developed the methodology, in collaboration with GD and HBP. Data analysis was mainly done by SV, supported by GD, and SV and GD collaborated on the presentation and interpretation of the data. SV had the lead in drafting and revising the manuscript, upon comments by GD and HBP. This article reflects GD’s views and not those of the OECD. After submission of the article, HBP transferred to UNICEF.

: This article does not contain any studies with human participants or animals performed by any of the authors.

: All data generated or analysed during this study are included in this published article (and its Electronic Supplementary Materials files, see in particular files S3–S5).