title: The Fox guarding the clinical trial: internal vs. external validity in randomized studies.
authors.forename: P J
authors.initials: PJ
authors.lastname: Goodwin
authors.forename: K I
authors.initials: KI
authors.lastname: Pritchard
authors.forename: D
authors.initials: D
authors.lastname: Spiegel
mesh_terms: D001943:Breast Neoplasms / Q000401:mortality / Q000523:psychology*; D003627:Data Interpretation, Statistical; D005260:Female; D006801:Humans; D011615:Psychotherapy, Group; D011897:Random Allocation; D016032:Randomized Controlled Trials as Topic / Q000592:standards*; D015203:Reproducibility of Results; D012107:Research Design; D015996:Survival Rate / Q000639:trends