Declaration of interest
The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.
Funding
This work was supported by three grants: (1) An unrestricted grant from Research to Prevent Blindness, Inc., New York, NY to the Department of Ophthalmology and Visual Sciences, University of Utah, (2) NIH EY014458, and (3) Research Committee, University of Thessaly, Greece [No. 2989].