From each subregion, four countries
were selected with probability proportional to population size (Table 1).
When there were less than four countries in a subregion, all countries within
that subregion were included. This process resulted in 12 subregions having
four countries each, and two subregions
having three countries each (Table 1).
It was decided that no replacement
would be made for a country that did
not participate.