 According to the Office of the Communication Authority in 2013, 65% of mobile phone users were 3G or 4G service customers. MIRROR, in an article from 2007, found that relation from mobile phones may produce exterditive stress in brain tissue, which can lead to a higher risk of brain tissue damage. A study by O'Neill and Breedy shows that a considerable number of apps are releasing health information without the approval from medical professionals. The paper by Lee and colleagues from 2012 argue that smartphones can help monitor the body condition of elderly patients. As Luston and his colleagues described in their 2011 paper, the apps can motivate users to engage in healthy behaviour, such as sports and keeping fit. Another team from Spain have also shown that smartphone apps have helped in developing a healthy lifestyle.