The American Economic Association's registry for randomized controlled trials
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181 Trials Found
Cross River State, Nigeria.
North
North (Gaibandha)
North (Kurigram)
north
Lagos, Kaduna, Kogi, Cross River, Enugu and Kano states
North Rhine Westphalia (NRW)
North Rhine-Westphalia
North-Holland
Upper eastern, lower eastern, western