But Russia's Health Ministry said in December it was cutting the size of the study from the planned 40,000 subjects to about 31,000 because some people left the study.

但俄罗斯卫生部去年12月表示，由于有些人退出了这项研究，该国正在将研究规模从计划的4万名受试者削减到约3。1万名。