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