1. Department of Ophthalmology, Yan’an People’s Hospital, Qilipu St., Baota Qu, Yan’an, Shaanxi 716000, China
2. Pathology Unit, Lab Based Department, Faculty of Medicine, Royal College of Medicine Perak, Universiti Kuala Lumpur, No. 3, Jalan Greentown, 30450 Ipoh, Perak, Darul Ridzuan, Malaysia
3. Department of Ophthalmology, Yan’an People’s Hospital, Bei Da Jie, Baota Qu, Yan’an, Shaanxi 716000, China