Onyemaechi, Azu O. Oponowicz, Agnieszka, Department of Human Physiology, Faculty of Medical Sciences, University of Warmia and Mazury, Olsztyn, Poland Orlowska-Heitzman, Jolanta Orozco-Barocio, Arturo Orzechowski, Arkadiusz Osamura, R Yoshiyuki Osemlak, Paweł Osiecka-Iwan, Anna Osiecka-Iwan, Anna, Department of Histology and Embryology, Medical University of Warsaw, Warsaw, Poland (Poland) Osiecka-Iwan, Anna Osowski, Stanisław Ossolińska, Maria Ostalska-Nowicka, Danuta, Department of Paediatric Cardiology and Nephrology, Poznan University of Medical Sciences, Poland Ostalska-Nowicka, Danuta Ostalska-Nowicka, Danuta, Department of Pediatric Cardiology and Nephrology, Poznan University of Medical Science, Poland (Poland) Ostas, Alina Ostrowska, Alina Ostrowski, Maciej Oszukowska, Elzbieta Oszukowska, Elzbieta Oszukowska, Elzbieta, II Department of Urology, Medical University of Lodz (Poland) OtevrelovĂĄ, Petra Othmani, Khira Otrocka-Domagala, Iwona Ouali-Hassenaoui, Saliha