[1] Univ Edinburgh, Edinburgh, Scotland
[2] Usher Inst, Coll Med & Vet Med, Edinburgh, Scotland
[3] Natl Inst Hlth & Care Res NIHR, Global Resp Hlth Unit, Southampton, England
[4] World Hlth Org WHO, UK NIHR, Southampton, England
[5] Ctr Global Hlth Res, Edinburgh, Scotland
[6] WHO Collaborating Ctr Populat Hlth Res & Training, London, England