William C Reeves
, Andrew Lloyd
, Suzanne D Vernon
, Nancy Klimas
, Leonard A Jason
, Gijs Bleijenberg
, Birgitta Evengard
, Peter D White
, Rosane Nisenbaum
, Elizabeth R Unger
and the International Chronic Fatigue Syndrome Study Group 
BMC Health Services Research 2003,
3:25doi:10.1186/1472-6963-3-25