Institute of Medical Technology, FI-33014 University of Tampere, Finland. memata@gmail.com|Institute of Medical Technology, FI-33014 University of Tampere, Finland. memata@gmail.com|Institute of Medical Technology, FI-33014 University of Tampere, Finland. memata@gmail.com|Institute of Medical Technology, FI-33014 University of Tampere, Finland. memata@gmail.com