Comparative efficacy and safety of the fixed versus unfixed combination of latanoprost and timolol in Chinese patients with open-angle glaucoma or ocular hypertension oleh Sun Nai-Xue, Sheng Yao-Hua, Li Yu-Min, Li Xiao-Xin, Ge Jian, Zhao Jia-Liang, Sun Xing-Huai, Yao Ke, Zhong Zheng