 In 2005, Per-Anders Rydelius, Professor of Child Psychiatry at the Karolinska Institute, and Rolf Zetterstrom, past chief editor of "Acta Paediatrica", have been critical of some research based on the Gothenburg study.In the Swedish trade journal "Dagens Medicin" they argued that the Gillberg group, in order to prove their hypothesis, repeatedly changed diagnoses and information in their material