“…Arguably, their views gained credence from clinical studies (Wakefield et al, 1998;Uhlmann et al, 2002). Subsequent studies considering the incidence of autism in relation to MMR among larger populations claim not to show an association (e.g., Taylor et al, 1999;DeWilde, Carey, Richards, Hilton, & Cook, 2001;Fombonne, 2001;see Miller, 2002, andJefferson, Price, Demicheli, &Bianco, 2003, for reviews). The debate turns, in part, on the significance attributed to epidemiological as opposed to clinical evidence, and on the status attributed to parents' own observations.…”