|
Overseas Development Institute (United Kingdom)
35
|
Mathematica Policy Research (United States)
12
|
Brookings Institution (United States)
2
|
|
Institute for European Environmental Policy (United Kingdom)
2
|
RAND Corporation (United States)
2
|
Chatham House (United Kingdom)
1
|
|
National Bureau of Economic Research (United States)
1
|
World Resources Institute (United States)
1
|
