1. Department of Ophthalmology, Xijing Hospital, Fourth Military Medical University, Xi'an, People's Republic of China; Department of Opthalmology, Faculty of Medicine, University of Leipzig, Leipzig, Germany.
2. Department of Ophthalmology, Xijing Hospital, Fourth Military Medical University, Xi'an, People's Republic of China
3. Department of Ophthalmology, Faculty of Medicine, University of Leipzig, Leipzig, Germany.