False memory synrome (FMS) is a term coined in 1992 by the False Memory Syndrome Foundation (FMSF) to describe their theory that some adults who belatedly remember instances of sexual abuse from their childhood may be mistaken about the accuracy of their memory; from this, the Foundation hypothesizes that the alleged false memories may have been the result of recovered memory therapy, another term coined by the FMSF in the early 1990s. The FMSF is an organization that advocates on behalf of individuals who claim they have been falsely accused of perpetrating child sexual abuse. Some of the influential figures in the genesis of this theory are forensic psychologist Ralph Underwager, psychologist Elizabeth Loftus and sociologist Richard Ofshe. Charles Whitfield, MD, in his 1995 book Memory and Abuse, states that all critics he had found of the studies validating delayed memories are members of the False Memory Syndrome Foundation advisory board. Whitfield and others have stated that the False memory syndrome is rare. The American Heritage Dictionary of the English Language, 4th Edition, 2000, defines "false memory syndrome" as "The belief that one remembers events, especially traumatic ones, that have not actually occurred. Not in scientific use."