In cohort @ , we randomly assigned @ patients to the @-week regimen ( @ with ribavirin and @ with no ribavirin ) and @ to the @-week regimen ( @ with ribavirin and @ with no ribavirin ) ; in cohort @ , we randomly assigned @ patients to the @-week regimen ( @ with ribavirin and @ with no ribavirin ) and @ to the @-week regimen ( @ with ribavirin and @ with no ribavirin .