Marko Lucijanic1, Sead Ziga2, Ivica Grgurevic3,4. 1. Haematology Department, University Hospital Dubrava, Av. Gojka Suska 6, 10000, Zagreb, Croatia. markolucijanic@yahoo.com. 2. Emergency Department, University Hospital Dubrava, Zagreb, Croatia. 3. Gastroenterology Department, University Hospital Dubrava, Zagreb, Croatia. 4. School of Medicine, University of Zagreb, Zagreb, Croatia.