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Despite their usefulness in healthcare research, online surveys are affected by well-known intrinsic limitations.27 28 First, the respondents are not selected through probability sampling, and this may impair the generalisability of the findings; in addition, information about non-respondents is not available. Thus, a self-selection bias may arise because some individuals are more likely than others to complete online surveys. Several factors have been associated with non-response in health surveys,29 including male gender, younger age, lower socioeconomic status, and poorer health and health behaviours. Thus, the lower rate of male respondents in our survey is not surprising and reflects a well-known gender bias in survey-based research, with women being more prone to participate in online surveys.30 31 59ce067264
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