translation.en: And so we started gathering scientists and started learning about population, learning about vaccines, learning about what had worked and what had failed, and that's really when we got going, was in late 1998, 1999.
translation.zh: 于是我们开始召集科学家们， 开始学习人口分布、疫苗， 了解了什么取得过成效、什么失败了， 那时才是我们真正开始慈善事业， 是在1998年后期，1999年。