1. From the Departments of Ophthalmology and
2. Department of Maternal and Child Health Care, School of Public Health, Shandong University, Jinan, People's Republic of China;
3. Infectious Disease, the Fourth Hospital of Harbin Medical University, Harbin, People's Republic of China;
4. Department of Epidemiology, Capital Institute of Pediatrics, Beijing, People's Republic of China;
5. Department of Physiology and Pathophysiology, Peking Union Medical College, Beijing, People's Republic of China; and
6. Baylor College of Medicine and The University of Texas MD Anderson Cancer Center, Houston, Texas.