Researchers showed that children who attended daycare or playgroups have a 30 percent lower risk of developing the most common form of childhood leukemia compared to those who did not.

• 研究人员显示，与其他的孩子相比，日托的孩子或者打堆一起玩的孩子，发生最常见形式的儿童白血病30%25的低风险。