SEVERITY AND CHRONICITY IN CFS / ME

1999

Natural History of Severe Chronic Fatigue Syndrome. NF Hill, LA Tiersky et al Arch Phys Med Rehabil 1999:80:1090-1094

2000

Symptom Patterns in long‑duration chronic fatigue syndrome. F Friedberg, L Dechene et al. Joumal of Psychosomatic Research 2000:48:59-68