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