Ni, Jiangdong Ni, Yan Niculescu, Dan Alexandru, Carol Davla University of Medicine and Pharmacy, Bucharest, Romania Niculescu, Dan A. Niebudek-Bogusz, Ewa, Nofer Institute of Occupational Medicine, Department of Audiology and Phoniatrics, Łódź, Poland Niedziałkowska, Krystyna Niedziela, Agata Niedziela, M. Niedziela, Marek Niedziela, Marek, Department of Paediatric Endocrinology and Rheumatology, Poznan University of Medical Sciences (Poland) Niedziela, Marek, Department of Paediatric Endocrinology and Rheumatology, Poznan University of Medical Sciences, Poznan, Poland Niedziela, Marek, Poznan University of Medical Sciences 2nd Chair of Paediatrics Department of Paediatric Endocrinology and Rheumatology Niedziela, Marek Niedzielska, Iwona Niedziołka, Danuta Niedziołka-Zielonka, Danuta Niedziołka-Zielonka, Danuta, Department of Pathophysiology and Endocrinology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice (Poland) Niedźwiecki, Maciej Niemczuk, Ewa, Department of Endocrinology and Diabetology, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz ul. Skłodowskiej-Curie 9, 85-094 Bydgoszcz Niemczyk, Kazimierz Niemczyk, Longin Niemczyk, Longin (Poland) Niemczyk, Stanisław Niemczyk, Stanisław Niemiec, Andrzej