US Trends in Refractive Surgery: 2009 ASCRS Survey Richard J. Duffey, MD David Leaming, MD Boston: April 13, 2010.
U.S. Trends in Refractive Surgery: 2012 ISRS Survey - Partner of AAO - Richard J. Duffey, MD David Leaming, MD Refractive Subspecialty Day Chicago: November.
