The American Economic Association's registry for randomized controlled trials
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171 Trials Found
A22, C90, I20
C78, C90
C11, C90, D83, D91
J71, C90, D12
C90, D72, D73.
C90, D43, D12, D83
C90; D01; D83; D91; R11
J24, J31, C90
D03 , D91 , H41, D64, C90
C72, C90, L13