作者单位：Department of Physics, University of Kuopio, Yliopistonranta 1 E, FI-70211 Kuopio, Finland[1]Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki[2]Department of Otorhinolaryngology, Helsinki University Central Hospital, Haartmaninkatu 4, FIN[3]Department of Anatomy, Institute of Biomedicine, University of Helsinki, Haartmaninkatu 8, FI-00014[4]
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