1. The need to belong: desire for interpersonal attachments as a fundamental human motivation;Baumeister;Psychological Bulletin,1995
2. Evaluation of cancer information on the Internet;Biermann;Cancer,1999
3. Using the Internet for clinical research;Carmichael;Physician Assistant,2003
4. Clark, S., 2004. Back to basics: meta tags. Available at: 〈http://www.webdeveloper.com/html/html_metatags.html〉 (accessed September 3).
5. ComputersScope L. 2002. NUA Internet Surveys. Available at: 〈http://www.nua.ie/surveys/〉 (accessed February 3).