title: Statistical problems of Thorotrast studies.
mesh_terms: D004812:Epidemiologic Methods; D005860:Germany, West; D006801:Humans; D009381:Neoplasms, Radiation-Induced / Q000209:etiology; D012107:Research Design; D013223:Statistics as Topic; D013911:Thorium Dioxide / Q000009:adverse effects*
chemical_list: D013911:Thorium Dioxide