1. School of Mathematics and Statistics Hanshan Normal University Chaozhou China
2. Institute of Paediatrics Guangzhou Women and Children’s Medical Centre Guangzhou Medical University Guangzhou China
3. State Key Laboratory of Ophthalmology Zhongshan Ophthalmic Center Sun Yat‐sen University Guangzhou China
4. Clinical Data Center Guangdong Provincial People’s Hospital/Guangdong Academy of Medical Sciences Guangzhou China