@article{201704.0059,
	doi = {10.20944/preprints201704.0059.v1},
	url = {https://doi.org/10.20944/preprints201704.0059.v1},
	year = 2017,
	month = {April},
	publisher = {Preprints},
	author = {Xiang Zhang and Guo-Tao Pan and Zeng-Li Zhang and Shasha Tao},
	title = {Vitamin D Deficiency Increases the Risk of Diabetic Retinopathy: A Meta-Analysis of Observational Studies},
	journal = {Preprints}
}