Acknowledgements
TB
The authors are grateful to the members of the Guideline Development Group (GDG) and the World Health Organization (WHO) secretariat and its advisors for providing technical support while establishing the research protocol: Kiu Tay-Teo, Fatima Suleman, Lisa Bero, Sabine Vogler. Additionally, Zaheer Babar, Jaime Espin and Kalipso Chalkidou contributed with constructive remarks on an early draft of the protocol and the technical report. Colleagues at York Health Economics Consortium (YHEC) who contributed to the extensive search, document management and screening process include Ross Birtles, Mick Arber, Chris Bartlett, and James Mahon. We thank Lynn Al-Tayara (LT) for her role in extracting data and are grateful to the other members of our systematic review team: Christine Leopold (CL), Lizanne Arnoldy, Tom Buijs (TB) and Daniela Moye Holz.Supplementary material associated with this article can be found, in the online version, at doi: