Yes, I'm pretty certain that Kerr has never used any historic ME definitions or the Nightingale definition, as a diagnostic criteria in any of his research. I'm not sure about Chia, but it's probably the same for him. So maybe their results are less impressive than they would have been using more specific diagnostic criteria than the CDC's criteria. I agree, it's good to keep that in mind when looking at their research. Judy Mikovits doesn't use historic definitions of ME either, but she uses her own specific selection criteria to make sure that her patients have a certain type of neurological or immune-related disease.