Data-driven intensity normalization of PET group comparison studies is superior to global mean normalization. - Per Borghammer; Joel Aanerud; Albert Gjedde (NeuroImage, 2009)

Subcortical elevation of metabolism in Parkinson's disease - A critical reappraisal in the context of global mean normalization. - Per Borghammer; Paul Cumming; Joel Aanerud; Stefan Förster; Albert Gjedde (NeuroImage, 2009)

Artefactual subcortical hyperperfusion in PET studies normalized to global mean: Lessons from Parkinson's disease. - Per Borghammer; Paul Cumming; Joel Aanerud; Albert Gjedde (NeuroImage, 2009)