1. Department of Ophthalmology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
2. Department of Pathology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
3. Department of Otolaryngology Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, China
4. Oftalmico Hospital, ASST Fatebenefratelli Sacco, Milan, Italy
5. Department of Ophthalmology, Centre for Public Health, Queen's University of Belfast, Belfast, UK