不幸的是，该研究还发现，在HPV疫苗预防癌症最有可能取得显著效果的33个国家中，有26个还没有引入疫苗接种机制。
Unfortunately, the study also found that of the 33 countries where HPV vaccines are most likely to have the greatest effect in preventing cancer, 26 had not yet introduced the vaccine.