Table 1

Eligibility criteria for participants

Inclusion criteria

Exclusion criteria


1. Aged 18 or above.

1. Participants who did not complete registration process [excluded before randomization].


1. Access to the Internet, and email at least on a monthly basis.

2. Participants who self-reported having obtained an influenza vaccination in 2010 prior to enrolment in the study [excluded from analysis].


3. Participants who self-reported to be influenced by other participants during the study to obtain (or not obtain) influenza vaccination [excluded from analysis].


Lau et al. BMC Health Services Research 2012 12:86   doi:10.1186/1472-6963-12-86

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