Obradovic, Vladimir Obradović, Vladimir, Institute for Nuclear Medicine, Clinical Centre of Serbia, Belgrade, Serbia Obradović, Vladimir, Center for Nuclear Medicine Clinical Center of Serbia, Faculty of Medicine University of Belgrade (Serbia and Montenegro) Obradovic, Vladimir B. Obradovič, Vladimir B., Institute for Nuclear Medicine, Clinical Centre of Serbia, Beograd, Serbia and Montenegro Ochman, Paweł Oczeretko, Edward, Institute of Computer Science, University of Białystok, Poland of Events, Calendar Oger, Tugdual Oguogho, Anthony Oh, Hoon-Kyu, Department of Pathology, Catholic University of Daegu School of Medicine Okada, Yukinori Oleksa, Robert Olesińska, Edyta, Department of Rheumatology and Pneumonology, Children’s Clinical Hospital, Medical University of Lublin, Poland Oleszczak, Krzysztof Oliveira, Ana Omar, Walid Omar, Walid (Egypt) Opala, Grzegorz Opalińska, Marta, Nuclear Medicine Unit, Endocrinology Department, University Hospital, Krakow, Poland Opielak, Grzegorz, Human Anatomy Department Medical University of Lublin Opławski, Marcin Orlando, Emanuela Orlando, Emanuela Orlando, Emanuela, 1st Division of Radiology, Spedali Civili Brescia, Brescia, Italy. (Italy)