Possible unanticipated protective effects of agents: An additional reason for using both normal and malformed controls in case-control studies of birth defects


  • Ernest B. Hook

    Corresponding author
    1. School of Public Health, University of California, Berkeley, Berkeley, California
    2. Department of Pediatrics, University of California, San Francisco, California
    • School of Public Health, Warren Hall, MCH-M.C. 7360, University of California, Berkeley, CA 94720-7360
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