References
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- Kanellopoulos AJ. Long term results of a prospective randomized bilateral eye comparison trial of higher fluence, shorter duration ultraviolet A radiation, and riboflavin collagen cross linking for progressive keratoconus. Clin Ophthalmol. 2012;6:97–101. doi:10.2147/OPTH.S27170
- Center for drug evaluation and research summary review of photrexa viscous and photrexa, and KXL system; July 29, 2015.