1. Department of Ophthalmology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, P. R. China
2. Institute of Environment and Ecology, Institute of Environmental Health and Ecological Security, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, P. R. China
3. College of Optometry, Wenzhou Medical University, Wenzhou, China
4. Department of Thyroid Breast Surgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, P. R. China