be used because of the variety of t

be used because of the variety of the populations studied, as well as the
common difficulty to access exact financial data. Current smokers were
defined as smokers at the time of the interview.

ผลลัพธ์ (อังกฤษ) 2:

be used because of the Variety of the populations studied, As well As the
common difficulty Exact Access to Financial Data. Current smokers were
defined at the time of the interview As smokers.