In this study, we applied a special multistage sampling methods due to the low prevalence of tobacco smoking among female population in China (about 3%), in which we choose one male smoker and one female smoker from each selected households whenever possible to increase the sample size of female smoker, is another strengthen of this study
All the GERA members were living in the Northern California region at the time of survey completion, however, as smoking prevalence has been shown to vary considerably across states 7,34 , considering the previous U.S
Flushing condoms There is a general misconception that condoms are biodegradable and it is, therefore, safe to flush them in the toilet
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Lighting the Right Way Lighting a cigar is an art