3 Department of ophthalmology and visual sciences, university of Chicago medical center, Chicago, IL, United States.
4 Ambulatory surgery department, Guillaume de Varye clinic, 210, route de Vouzeron, 18230 Saint-Doulchard, France.
5 Ambulatory surgery department, Avranches Granville hospital, 849, rue des Menneries, 50400 Granville, France. Electronic address: tjhr78@hotmail.com.