[RESULTS] The intention-to-treat eradication rates were 94.7 % ( 95 % confidence interval ( CI ) = 88.8-100 % , 54/57 ) in the antimicrobial susceptibility-guided group and 71.9 % ( 95 % CI = 60.2-83 .5 % , 41/57 ) in the clarithromycin-based triple therapy group after the initial treatment ( P = 0.002 ) , whereas the per-protocol ( PP ) eradication rates were 96.4 % ( 95 % CI = 91.5-100 % , 54/56 ) in the antimicrobial susceptibility-guided group and 73.2 % ( 95 % CI = 61.5-84 .8 % , 41/56 ) in the clarithromycin-based triple therapy group ( P = 0.001 ) .