Authors' reply to the comment by Ferrari.

摘要

The majority of the Singaporean and Australian populations use the Internet (Australian Bureau of Statistics, 2011; Nielsen, 2011), hence our decision to recruit subjects who have Internet access. We recruited subjects from Singapore and Brisbane, cities with similar Internet connectivity. The recruitment of participants through the Internet could have biased the study towards people who were more Internet savvy and may therefore be better informed than non-Internet users (Ng et al., 2013) due to wider access to information in the World Wide Web.