PERTH, Australia, April 30 /PRNewswire/ -- Parents are being warned that computers may be causing physical problems for their children. The warning comes in a set of 12 new evidence-based guidelines - the first of their kind - produced by an international team of experts led by Professor Leon Straker of Curtin University of Technology. The team, with representatives from Harvard University, the University of Queensland and the University of Washington, has researched the guidelines for more than 10 years.