translate English to French: The surgical procedures have also been demonstrated to be safe and effective, and no mortality has been recorded using these methods to date.
Il a aussi Ã©tÃ© dÃ©montrÃ© que la procÃ©dure chirurgicale est efficace et sans danger; de fait, aucun cas de mortalitÃ© n'a Ã©tÃ© signalÃ© Ã ce jour.