Field Experiments , Health Behavior , Health and Economic Development
C93, D91, D83, I31
C93, I38, J21, H24
C93, H55, I38, J65
C93, D63, D31, H23, J62
I23, M52, M55, C93
I38; O15; J08; J24; J68
I2 Education and Research Institutions
D31, I38, C93, C92, O12
J68, J64, C93