Effect of chronic proton pump inhibitor therapy on complete blood count parameters and selected trace elements – pilot study Authors: Olga Kaczmarczyk, Magdalena Przybylska-Feluś, Agnieszka Piątek-Guziewicz, Kacper Wcisło, Mirosław Krośniak, Jadwiga Kryczyk-Kozioł, Krzysztof Kleszcz, Paweł Zagrodzki, Dorota Cibor, Tomasz Mach, Małgorzata Zwolińska-Wcisło Article type: Original article Received: November 5, 2019. Accepted: December 11, 2019. Published online: December 11, 2019. ISSN: 1897-9483 This is an Open Access article distributed under the terms of the Creative Commons Attribution‑NonCommercial‑ShareAlike 4.0 International License (CC BY‑NC‑SA4.0), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited, distributed under the same license, and used for noncommercial purposes only. For commercial use, please contact the journal office at pamw@mp.pl.