A 4-week, randomized, double-masked study to evaluate efficacy of deproteinized calf blood extract eye drops versus sodium hyaluronate 0.3% eye drops in dry eye patients with ocular pain - Wu, Yaying; Jin, Xiuming; Mou, Yujie; Yuan, Kelan; Min, Jinjin; Huang, Xiaodan (Annals of Palliative Medicine, 2021)