Dr. Mariusz Niemczyk is an Associate Professor in the Department of Immunology, Transplant Medicine, and Internal Diseases of the Medical University of Warsaw, Poland. He is specialized in internal medicine and nephrology. His research interests include Polycystic kidney disease, Renal transplantation, Liver transplantation, Immunosuppressive therapy in transplant medicine and nephrology, Other diseases with renal cysts, and Transplant medicine.