title: Covariance analysis of censored survival data.
mesh_terms: D000367:Age Factors; D002675:Child, Preschool; D003609:Dactinomycin / Q000627:therapeutic use; D006801:Humans; D007945:Leukemia, Lymphoid / Q000188:drug therapy / Q000401:mortality*; D007958:Leukocyte Count; D015122:Mercaptopurine / Q000627:therapeutic use; D008727:Methotrexate / Q000627:therapeutic use; D008954:Models, Biological; D009588:Nitrogen Mustard Compounds / Q000627:therapeutic use; D011379:Prognosis; D012044:Regression Analysis; D012075:Remission, Spontaneous; D013223:Statistics as Topic; D013997:Time Factors
chemical_list: D009588:Nitrogen Mustard Compounds; D003609:Dactinomycin; D015122:Mercaptopurine; D008727:Methotrexate