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Estudio caso-control: caso control: 268/268<br />
OR (uso AO)= 1,5 (1,1-2,1) (1,1 2,1)<br />
OR (12 (12 meses AO)= 1,7 (1,2-2,6) (1,2 2,6)<br />
El riesgo aumenta con la<br />
duración del uso<br />
PARAZZINI et al, 2002