I would be interested to see it peer reviewed, as I have questions about the structure of the study and the interpretation of the data, and the integrity of the data.
For example, one group is dominated by two countries, Ethiopia and Nigeria Pop.320m, does that negate the impact of the other countries in the same group.
The study, "suggests", "may", and is not peer reviewed.
In other words, I would not read too much into the study, as it stands.
