1. From the Departments of Ophthalmology & Visual Sciences and
2. Joint Shantou International Eye Center of Shantou University and Chinese University of Hong Kong, Shantou, China; and
3. Obstetrics & Gynaecology, Chinese University of Hong Kong, Hong Kong, China;
4. Center for Human Molecular Biology and Genetics, Sichuan Academy of Medical Sciences, Chengdu, Sichuan, China; and 5Sichuan Provincial People's Hospital, Chengdu, Sichuan, China.