1. Department of Oncology, Vasa Central Hospital, Vaasa, Finland;
2. Department of Pathology, Vasa Central Hospital, Vaasa, Finland;
3. Department of Biological and Environmental Science, Nano Science Center, University of Jyväskylä, Jyväskylä, Finland;
4. Department of Oncology and Radiotherapy, University of Turku, Turku, Finland