Impact of Free Glasses and a Teacher Incentive on Children's Use of Eyeglasses - A Cluster-Randomized Controlled Trial - Yi, H; Zhang, H; Ma, X; Zhang, L; Wang, X; Jin, L; Naidoo, K; Minto, H; Zou, H; Lu, L; Rozelle, S; Congdon, N (2015)
rct; evidence grade B