Division of Hygiene and Epidemiology, Faculty of Medicine, Medical University of Gdansk, Gdansk, Poland

Received 5 October 2021 Accepted 3 February 2022

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Correspondence to Przemysław Waszak, MD, PhD, Division of Hygiene and Epidemiology, Faculty of Medicine, Medical University of Gdansk, Dębinki 7, 80-211, Gdańsk, Poland, Tel: +48 58 349 18 20; e-mail: [email protected]