Artifical nails and Infections

I know many hospitals have banned or are in the process of banning artifical nails.
If you work for a hospital that has banned them for awhile, can you please find out if your rates of infection have dropped? I'm doing a college project on this subject but cannot find any after the fact studies to show banning the nails has made a difference.
Thanks!
(If there are any studies you know of, I'd love to see them too!)