Article: Rethinking ME/CFS Diagnostic Reference Intervals via Machine Learning, and the Utility of Activin B for Defining Symptom Severity https://pubmed.ncbi.nlm.nih.gov/31331036/ Authors Brett A. Lidbury 1,* , Badia Kita 2 , Alice M. Richardson 1 , Donald P. Lewis 3 , Edwina Privitera 3 , Susan Hayward 4 , David de