Effect of providing free glasses on children's educational outcomes in China: cluster randomized controlled trial
Crossref DOI link: https://doi.org/10.1136/bmj.g5740
Published Online: 2014-09-23
Published Print: 2014-09-23
Update policy: https://doi.org/10.1136/crossmarkpolicy
Ma, X.
Zhou, Z.
Yi, H.
Pang, X.
Shi, Y.
Chen, Q.
Meltzer, M. E.
le Cessie, S.
He, M.
Rozelle, S.
Liu, Y.
Congdon, N.