On All Things Considered this morning (4/21) there was a report about Chronic Fatigue Syndrome, that 14 papers have just been published about the disease and they've identified some common factors that make it identifiable as a specific disease.
The study model was interesting: Find a bunch of people with the disease and poke and prod them for a few days and gather every tiny bit of test info and number-crunch the results. It's yielded 14 papers out of four research groups who were supplied with all the raw data. It's a model they may repeat for other diseases.
Sue