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. 2018 Apr 9;111(8):448–458. doi: 10.1080/20477724.2018.1452844

Figure 4.

Figure 4.

Scale. Local interventions can be developed in collaboration with early adopter communities and may be released after receiving regulatory approval from a single country. Interventions anticipated to spread without limit on their own are difficult to safely test at small scale and can face diplomatic complications given the likelihood of international spread.