A blood test that can diagnose chronic fatigue syndrome and that could potentially help identify treatments for the baffling illness has been discovered by Stanford University School of Medicine and U.C. Irvine researchers. … The researchers -- senior author Ronald W. Davis, … lead author Rahim Esfandyarpour, a University of California-Irvine assistant professor of electrical engineering and computer science, and their colleagues -- published their breakthrough in a paper online in the "Proceedings of the National Academy of Sciences" in late April.