1. Department of Surgery #4, Bogomolets National Medical University, Kiev, Ukraine;
2. Department of Oncology-Pathology, Karolinska Institutet, Stockholm, Sweden;
3. Department of Plastic and Maxillofacial Surgery, Uppsala University Hospital, Uppsala, Sweden;
4. Department of Plastic Surgery, Harmony Hospital, Kiev, Ukraine;
5. Department of Pathology, Kyiv City Teaching Oncology Center, Kiev, Ukraine