If you ll look at the Canadian Consensus Document you ll see a good number of widely respected and experienced physician and researchers The Pediatric Definition was created by the professional society of CFS researchers IACFS ME researchers and it is very similar to the Canadian Consensus Document The IACFS ME is shortly coming out with a new research definition Bleijenberg a CFS researcher focused on CBT et al supports the fundamental outlines of the Canadian Criteria stating that post exertional malaise a central focus of the Criteria is afundamental part of CFS and needs to be accounted for in the definition Cort