A study published this year i.e. subsequent to this paper, is a good example to cite to make this point.
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0197811
Jason LA, King CP, Richman JA, Taylor RR, Torres SR, Song S. US case definition of chronic fatigue syndrome: Diagnostic and theoretical issues. Journal of Chronic Fatigue Syndrome. 1999; 5:3–33. doi: 10.1300/J092v05n03_02.
Very useful to have such summaries, I think.
Regarding the following:
Twisk didn't do his own survey, he just referred to the results from a paper published in 1990:
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