| Reference | WHO regions | Number of countries | Countries included |
| Rohlman et al. (2012) [51] | The Americas, Eastern Mediterranean | 3 | Egypt, Lebanon, United States |
| Ersado (2005) [52] | Africa, The Americas, Eastern Mediterranean | 3 | Nepal, Peru, Zimbabwe |
| Pinzón-Rondóna et al. (2009, 2010) [53, 54] | The Americas | 4 | Brazil, Colombia, Ecuador, Peru |
| Whetten et al. (2011) [55] | Africa, Southeast Asia | 5 | Cambodia, Ethiopia, India, Kenya, Tanzania |
| Levison and Langer (2010) [56] | The Americas | 6 | Chile, Argentina, Mexico, Costa Rica, Brazil, Colombia |
| Gamlin et al. (2015) [57] | Africa, The Americas, Southeast Asia, Western Pacific | 6 | Costa Rica, India, Peru, Philippines, Tanzania, Togo |
| Webbink et al. (2012) [58] | Africa, Southeast Asia | 16 | Bangladesh, Burundi, Central African Republic, Cote d’Ivoire, Gambia, Ghana, Guinea Bissau, Sierra Leone, Togo, Malawi, Mauritania, Somalia, Syria, Thailand, Vietnam, Yemen |
| Roggero et al. (2007) [59] | Africa, The Americas, Eastern Mediterranean, Southeast Asia, Western Pacific | 83 | Algeria, Angola, Bangladesh, Belize, Benin, Bolivia, Botswana, Brazil, Burkina Faso, Burundi, Cambodia, Cameroon, Chad, Chile, China, Congo, Colombia, Cote d’Ivoire, Costa Rica, Democratic Republic of Congo, Dominican Republic, Egypt, Ecuador, El Salvador, Eritrea, Gabon, Gambia, Ghana, Guatemala, Guinea, Guinea Bissau, Haiti, Honduras, India, Indonesia, Iran, Iraq, Jamaica, Jordan, Kenya, Laos, Liberia, Libya, Lesotho, Madagascar, Malaysia, Malawi, Mali, Mexico, Mongolia, Mozambique, Morocco, Myanmar, Namibia, Nepal, Nicaragua, Niger, Nigeria, Oman, Pakistan, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Rwanda, Senegal, Sierra Leone, Solomon’s Islands, Sri Lanka, Sudan, Swaziland, Syrian Arab Republic, Uganda, Uruguay, Tanzania, Venezuela, Vietnam, Thailand, Togo, Yemen, Zambia, Zimbabwe |
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