Analyses: Data for the primary and secondary end points will be analyzed according to the intention-to -treat principle. The intention-to-treat analysis will include all randomly assigned patients. For the efficacy end points, investigators will use the Mann-Whitney U test. We will also use competing risk regression models according to Fine and Gray. For the safety end points, comparisons will be made with the use of the chi-square test. Separate analyses will be done in key prespecified subgroups of patients, according to age and hospital size.