This seem to sum it up https://web.archive.org/web/20080827140005/http://www.wired.com/medtech/health/news/2004/02/62339 https://web.archive.org/web/2008082714

This seem to sum it up https://web.archive.org/web/20080827140005/http://www.wired.com/medtech/health/news/2004/02/62339 https://web.archive.org/web/20080827140005/http://www.wired....