1. Hong Kong Government, Findings of the “Household survey on information technology usage and penetration” for 2007. http://www.info.gov.hk/digital21/eng/statistics/it_survey2007.html (accessed on August 20, 2008).
2. Office of the Telecommunication Authority, Key telecommunication statistics. http://www.ofta.gov.hk/datastat/key_stat.html (accessed on August 20, 2008).
3. Rice, R. E., Influence, usage and outcomes of Internet health information searching: multivariate results from the Pew surveys. Int. J. Med. Inform. 75:8–28, 2006 doi: 10.1016/j.ijmedinf.2005.07.032 .
4. Harris Interactive, Cyberchondriacs update [Online], 2002. http://www.harrisinteractive.com/harris_poll/index.asp?PID=299 (accessed on November 2, 2006).
5. Fox, S., Health information online, pew internet and American life project. Pew Charitable Trust, Washington DC, 2005 http://www.pewinternet.org (accessed on November 2, 2006).