 On August 27, 2018, the editors of PLOS One initiated a reevaluation of an article published two weeks earlier by Brown University School of Public Health assistant professor Lisa Littman.The study described a phenomenon of social contagion, or "cluster outbreaks" in gender dysphoria among young people, which Littman called "rapid-onset gender dysphoria".Data was obtained from a survey placed on three websites for concerned parents of children with gender dysphoria, asking for responses from parents whose children had experienced "sudden or rapid development of gender dysphoria beginning between the ages of 10 and 21".