Clinical efficacy of ball head type lacrimal duct expansion drainage tube on nasolacrimal duct obstruction
XU Wen-shuang1, LENG Zhong-yu1, HE Xiao-di2
Ophthalmology in China . 2017, (6): 372 -374 .  DOI: 10.13281/j.cnki.issn.1004-4469.2017.06.003