 Although there has always been concern about the content of films,<ref></ref> the MPAA has, in recent years, been accused of a "ratings creep", whereby the films that fall into today's ratings categories now contain more objectionable material than those that appeared in the same categories two decades earlier.<ref></ref> A study put forward by the Harvard School of Public Health in 2004 concluded that there had been a significant increase in the level of profanity, sex and violence in films released between 1992 and 2003.<ref name=pmid15520625></ref> Kimberly Thompson, director of the study, stated