Prof. KORZENIEWSKI Krzysztof MD, PhD: Head of Department of Epidemiology and Tropical Medicine, Gdynia, POLAND; Professor at Military Institute of Medicine, Warsaw, POLAND; Professor at Gdańsk Medical University, Institute of Maritime and Tropical Medicine, Department of Occupational, Metabolic and Internal Diseases, Gdynia, POLAND; Specialist in epidemiology, maritime and tropical medicine, dermatology and venereology.