作者单位:Univ Eastern Finland, Dept Appl Phys, Kuopio, Finland[1]Univ Santiago de Compostela, Hlth Res Inst Santiago de Compostela, Dept Neurol, Clin Neurosci Res Lab, Santiago De Compostela, Spain[2]Univ Eastern Finland, AI Virtanen Inst Mol Sci, Kuopio, Finland[3]UCL, Dept Med Phys & Biomed Engn, London, England[4]