1. Department of Ophthalmology, Yidu Central Hospital of Weifang, Qingzhou, People's Republic of China.
2. Department of Hepatobiliary and Vascular Surgery, Yidu Central Hospital of Weifang, Qingzhou, People's Republic of China.
3. Department of Ophthalmology, The Affiliated Hospital of Weifang Medical University, Weifang, People's Republic of China.