Committee's action has compromised continuing studies

doi:10.1136/bmj.311.7020.1639

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M William L Davis,
Michael Lewis,
Linda De Caestecker,
Ronald Mann

Acting director Associate director Potsdam Institute of Pharmacoepidemiology and Technology Assessment, D-14482 Potsdam, Germany
Director, Glasgow centre, transnational study Department of Public Health, Glasgow University, Glasgow G12 8QQ
Director, Southampton centre, transnational study Drug Safety Research Unit, Southampton University, Southampton SO13 1AA

EDITOR,--Douglas Carnall's report of the controversy over whether the third generation contraceptive pills are associated with an increased risk of thrombosis contains an error that illustrates how bias may arise in a case-control study such as that led by Professor Walter Spitzer.1 Carnall states that the study “matches …