Marek, Bogdan, Department of Pathophysiology and Endocrinology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia,, Katowice, Poland Marek, Bogdan, Department of Pathophysiology and Endocrinology, School of Medicine with the Division of Dentistry in Zabrze Marek, Bogdan, Department of Pathophysiology and Endocrinology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice Marek, Bogdan, Department of Endocrinology, Hospital Rybnik, Poland Mariak, Zofia Marinescu, Mihai C. Markiewicz, Anna Markowicz, Anna Markuszewski, Leszek, Department of Endocrinology and Metabolic Diseases, Polish Mother’s Memorial Hospital – Research Institute, Poland, Maroulis, Ioannis Marszalski, Maciej Marszał, Magdalena Marszałek, Andrzej Martin, Sorina Martín-Leyva, Ana Martiník, Daniel Martiník, Karel Marturano, Ilenia Martyńska, Lidia Martyńska, Lidia Marzec, Adrianna Masajtis-Zagajewska, Anna Mastorakos, George Masucci, Romilda Maszczyk, Agata, Department of Nephrology, Transplantation and Internal Medicine, Medical University of Silesia, Katowice, Poland