What impact can mobile phones have on their users’ health Many people worry about the supposed ill effects caused by radiation from handsets and base stations, (1) the lack of credible evidence of any harm. But evidence for the beneficial effects of mobile phones on health is rather more (2) Indeed, a systematic review (3) out by Rifat Atun and his colleagues at Imperial College, rounds up 150 (4) of the use of text-messaging in the (5) of health care. These uses (6) three categories: efficiency gains; public-health gains; and direct benefits to patients by (7) text-messaging into treatment regimes.Using texting to (8) efficiency is not profound science, but big savings can be achieved. Several (9) carried out in England have found that the use of text-messaging reminders (10) the number of missed appointments with family doctors by 26-39%, and the number of missed hospital appointments by 33-50%. If such schemes were (11) nationally, this would translate (12) annual savings of ￡256-364 million.Text messages can also be a good way to deliver public-health information, particularly to groups (13) are hard to reach by other means. Text messages have been used in India to (14) people about the World Health Organization’s strategy to control lung disease. In Iraq, text messages were used to support a (15) to immunize nearly 5 million children (16) paralysis.(17) , there are the uses of text-messaging as part of a treatment regime. These involve sending reminders to patients to (18) their medicine, or to encourage accordance with exercise regimes. However, Dr. Rifat notes that the evidence for the effectiveness of such schemes is generally (19) , and more quantitative research is (20) 12（）

A. into
B. for
C. on
D. from