1. Gerr F, Marcus M, Monteilh C. Epidemiology of musculoskeletal disorders among computer users: Lessons learned from the role of posture and keyboard use. J Electromyogr Kinesiol 2004;14:25–31.
2. United Nations. http://millenniumindicators.un.org/unsd/mi/mi_series_results.asp?rowID=606; 2006.
3. US Census Bureau. Computer Use in the United States, Current Population Reports, P20-522, September, 1999.
4. National Center for Education Statistics. Issues in Brief. Rates of Computer and Internet use by Children in Nursery School and Students in Kindergarten Through Twelfth Grade: 2003. Institute of Education Sciences, US Department of Education, 2005.
5. Tittiranonda P. Burastero S. Rempel D. Risk factors for musculoskeletal disorders among computer users. Occup Med 1999;14:17–38