1. Department of Dentistry, Faculty of Medical Science, Albanian University, 1001 Tirana, Albania
2. Department of General and Visceral Surgery, Ulm University Hospital, 89075 Ulm, Germany
3. Faculty of Medicine, Head of Statistic Service, UHC “Mother Teresa”, University of Medicine Tirana, 1001 Tirana, Albania
4. O.SH.K.SH, 1001 Tirana, Albania