21 Saw SM, Hong RZ, Zhang MZ, Fu ZF, Ye M, Tan D, Chew SJ. Near-work activity and myopia in rural and urban schoolchildren in China. J Pediatr Ophthalmol Strabismus. 2001 May-Jun;38(3):149-55.

21 Saw SM, Hong RZ, Zhang MZ, Fu ZF, Ye M, Tan D, Chew SJ. Near-work activity and myopia in rural and urban schoolchildren in China. J Pediatr Ophthalmol Strabismus. 2001 May-Jun;38(3):149-55.