1. University Clinic of Gastrohepatology, University Hospital Center “Mother Theresa”, Dibra Street No. 370, Tirana, Albania
2. Department of Laboratory Medicine, University Hospital Center “Mother Theresa”, Tirana, Albania
3. Institute of Statistics (INSTAT), Tirana, Albania
4. Department of International Health, CAPHRI School for Public Health and Primary Care, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, The Netherlands