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The masks were typically made of fabric, often with layers of gauze or other materials to filter the air and reduce the unpleasant smells

Cant be engineered, but has it been triggered and expanded

To understand can smoking affect hair transplant results, it is important to understand how transplanted grafts survive

Applying Bayess rule, we have odds(smoker | cancer) = odds(smoker) * p(cancer | smoker) / p(cancer | non-smoker) Rearranging terms, we can solve for the risk ratio: p(cancer | smoker) / p(cancer | non-smoker) = odds(smoker | cancer) / odds(smoker) = 16 Thats the answer I had in mind, but let me address an objection raised by one poll respondent, who chose Other because, You cant draw casual inferences from observational data without certain assumptions which Im unwilling to make. Thats true