Competing interests: The BMJ has judged that there are no disqualifying financial ties to commercial companies. The authors declare the following other interests: DV and MO’R are co-chairs of the Latin America regional advisory board. Further details of The BMJ policy on financial interests are here: https://www.bmj.com/sites/default/files/attachments/resources/2016/03/16-current-bmj-education-coi-form.pdf Provenance and peer review: Commissioned; not externally peer reviewed.