I'll hand this mostly to my colleague Rachel, but I think one of the realities of this particular piece is that those 73% may be residing in middle-income countries right now. The trend lines are what we need to watch out for, and the volatility is such that some of the things we're listening to right now—Zika or Ebola—are things we really didn't hear much about when the last priorities were set.
I don't want to dodge the question. In a sense we're a little agnostic on the country prioritization matter, as long as there's flexibility in the policy to meet the changing realities affecting human beings writ large in these contexts.
I think Rachel can speak to some of that.