1. Department of Oncology, ‘Ovidius’ University, 900527 Constanţa, România
2. Department of Gastroenterology, ‘Ovidius’ University, 900527 Constanţa, România
3. Department of Oncology, ‘Carol Davila’ University of Medicine and Pharmacy, 050474 Bucharest, România
4. Department of Oncology, ‘Victor Babes’ University of Medicine and Pharmacy, 300041 Timisoara, România