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Confounding by indication in non-experimental evaluation of vaccine effectiveness: the example of prevention of influenza complications
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  1. Correspondence to:
 Dr E Hak, University Medical Center Utrecht, Julius Center for General Practice and Patient Oriented Research, Location Stratenum, PO Box 85060, 3508 AB Utrecht, Netherlands;
 E.Hak{at}med.uu.nl
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Citation

Hak E, Verheij TJM, Grobbee DE, et al
Confounding by indication in non-experimental evaluation of vaccine effectiveness: the example of prevention of influenza complications

Publication history

  • Accepted January 18, 2002
  • First published December 1, 2002.
Online issue publication 
December 01, 2002

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