Warning: It's co-authored by Knoop & van der Meer. https://www.prohealth.com/library/p...-plasma-tgf-β1-chronic-fatigue-syndrome-86479
This is a very old story. Essentially it says 'a badly controlled study was done about ten years ago and because the result does not suit us we want to make sure we publish this fact, even if it has taken us ten years to get the paper accepted'. The point that you have to treat test and control samples the same is not something that needs to be put in a paper. It should be known to every lab scientist. If lab scientists choose to forget it it is unlikely that a paper like this will make any difference.
