The paper that you're citing argues that correcting for age is inappropriate because it's possible that not all children in the "vaccinated" group actually received vaccines during the study period so it may have introduced bias
Lol. As I said, you can do your own work. And if you didn't learn that applying objections raised 20 years ago about a different paper to a new study with a different design is total nonsense in your MPH, you should ask for your money back 
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Lol, first MPH I've met who doesn't know how to access research


End of conversation
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