Selya AS, Wissmann R, Shiffman S, et al
However, these maintenance needs are generally predictable and part of a scheduled plan
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
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It is to ensure that the calendar contains at least one or two in-person, sustained interactions per week with people who matter
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