Subjects were randomly assigned to a 14-day course of one of the following regimens : group A , placebo ( tid ) + LDA ; group B , rebamipide ( 100 mg tid ) + LDA ( 100 mg once-daily ) ; group C , placebo + LDA + clopidogrel ( 75 mg once-daily ) ; or group D , rebamipide + LDA + clopidogrel .