Problems and advantages of an observational data base approach to evaluating the effect of therapy on outcome. [electronic resource]

By: Contributor(s): Producer: 19820807Description: 27-32 p. digitalISSN:
  • 0009-7322
Subject(s): Online resources: In: Circulation vol. 65
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Publication Type: Clinical Trial; Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.

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