Parasitic infections among patients hospitalized in the Tropical and Parasitic Clinic of Poznan University of Medical Sciences, Poland between 2015 and 2018. Is there a relationship between protozoa infection and gastrointestinal symptoms? - Łukasz Pielok; Matylda Kłudkowska; Krystyna Frąckowiak; Jerzy Stefaniak (Gastroenterology Review)