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Funding Grants NMRC/0808/2003, NMRC/CPG/002/2003, NMRC/0982/2005 and NMRC/1206/2009 from National Medical Research Council (NMRC), Singapore; an unrestricted grant from Allergan (Irvine, California, USA); and grant 07JCYBJ09800 from Tianjin Committee of Science and Technology Fundamental Research Project.
Competing interests None.
Patient consent Obtained.
Ethics approval This study was conducted with the approval of the Institutional Review Board of the Singapore Eye Research Institute and Tianjin Medical University Eye Center.
Provenance and peer review Not commissioned; externally peer reviewed.