A new study by the University of Michigan Medical School has found people increasingly rely on online ratings when choosing a physician. Researchers discovered 59 percent of the more than 2000 people surveyed in the US said online rating sites were at least 'somewhat important' when picking doctors and the number of those utilizing such sites had increased substantially in only a few years. 'The usage is increasing over time' lead study author Dr. David Hanauer said. 'We need to be aware that these sites are being used. I think there are still valid concerns whether these sites are trustworthy.'