Niklas, Arkadiusz A., Department of Hypertension, Angiology and Internal Medicine, Poznan University of Medical Sciences, Poland Niklas, Karolina Niklas, Karolina, Department of Rheumatology and Internal Diseases, Poznan University of Medical Sciences, Poland Niklas, Karolina, Department of Rheumatology and Internal Diseases, Poznan University of Medical Sciences, Poznan, Poland (Poland) Niklas, Karolina, Department of Rheumatology and Internal Diseases, Poznan University of Medical Sciences, Poznan, Poland Niklewski, Tomasz, Dept of Cardiac Surgery and Transplantology, Silesian Center For Heart Diseases Zabrze Niklewski, Tomasz, Dept. of Cardiac Surgery, Silesian Center For Heart Diseases, Zabrze, Poland Niklewski, Tomasz Niklewski, Tomasz Nikodemska, Iwona Nikolaou, Nikolaos Nikolic, Aleksandra Tomislav Nikolic, Dusan, Clinical center Kragujevac, Interventional cardiology Nikolić-Heitzler, Vjeran Nikolov, Lachezar, “Medica Core” Cardiology Hospital, Ruse, Bulgaria Nikolov, Pavel Nikolova, Neli Georgieva Niranjan, Murthy Nistri, Stefano Nistri, Stefano Niu, Hongxia Niu, Tong Niwald, Marek Niwińska, Anna Niżankowski, Rafał