Computer game addiction a medical disorder - WHO

The World Health Organisation has formally recognised addiction to computer games as a medical disorder. The WHO's latest "International Classification of Diseases" describes it as a pattern of persistent or recurrent gaming behaviour so severe that it takes "precedence over other life interests". Some countries had already identified it as a major public health issue. Dr Richard Graham is a digital psychiatrist and an expert on technology or internet addiction. He speaks to Guyon Espiner.