1. Centre for Biosystems & Genomic Network Medicine, University of Ioannina, Ioannina, Greece
2. Dept. of Surgery, Ioannina University Hospital, Ioannina, Greece
3. Dept. of Surgical Sciences & Human Morphology, Insubria University Hospital, Varese, Italy
4. Second Department of Propedeutic Surgery, Athens University Medical School, 'Laiko' Hospital, Athens, Greece
5. Biomedical Research Foundation of Academy of Athens (BRFAA), Systems Biology, Athens, Greece