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our updated search strategies can be found in Additional file 1: Appendix 3

Students of all ages attending school on the day of the survey answered a standard self-administered core questionnaire with closed ended responses and a set of optional questions adapted by countries according to local needs and priorities

Considering the possibility of smoking status changes, we performed a sensitivity analysis on 14,337 PD participants who had maintained the same smoking status on the second NHSP, and the results were still nonsignificant

Many individuals who are addicted to chewing tobacco are simply unaware of just how serious the consequences are