1. National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, Beijing, P.R. China.
2. Department of Ophthalmology, Peking Union Medical College Hospital, Peking Union Medical College, Eye Research Center of Chinese Academy of Medical Sciences, Beijing, P.R. China.
3. Department of Infectious Disease, Affiliated Youan Hospital, Capital University of Medical Science, Beijing, P.R. China.
4. Department of Epidemiology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, Beijing, P.R. China.