[1] Univ Debrecen, Dept Ophthalmol, Debrecen, Hungary
[2] Johns Hopkins Univ, Wilmer Eye Inst, Dept Ophthalmol, Baltimore, MD 21218 USA
[3] Johns Hopkins Univ, Appl Phys Lab, Baltimore, MD 21218 USA
[4] Univ Debrecen, Dept Biochem, H-4012 Debrecen, Hungary