I did a google search on "removal clitoral hood". The first few links it came up with are below. I didn't read through them because my Dom is coming home now and I'm running VERY late, yikes.
Use google and type in the words I did.
Next, try searching for hoodectomy rather than clitoridectomy as it seems the latter brings up female mutilation instead of the medical procedure you want.
Hope I've helped!!! =) Good luck
http://www.geocities.com/hoodectomy/MedicalStudies.htm
http://www.portaljuice.com/clitoral_hood.html
http://www.geocities.com/hoodectomy/hoodectomy.html