Paper published this month in a recognised journal using a statistically significant sample of 60 patients. What, you couldn't cope with the idea that the scientists had names you couldn't pronounce?
Took a quick look at the paper and it looked as valid as any other scientific paper I have ever read before. Perhaps you might like to check it out at:
http://www.ncbi.nlm.nih.gov/pubmed/21946616
"Bias", so what, can't I express my view on the matter.