那為啥CDC在國會聽證會上承認所有的疫苗都沒有controlled study呢?

來源: 2015-12-27 11:19:00 [博客] [舊帖] [給我悄悄話] 本文已被閱讀:
"We have not studied vaccinated vs. unvaccinated."
- Dr. Boyle, CDC

In a hearing of the House Government Reform and Oversight Committee, Congressman Posey questions two officials, Dr. Guttmacher and Dr. Boyle, from the CDC over autism research. November 29, 2012.

"Rising Autism Rates: House Oversight and Government Reform Committee"
https://www.youtube.com/watch?v=uNWTOmEi_6A