Doina Piciu1, Elena Barbus2, Claudiu Pestean2, Andra Piciu3. 1. Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania. 2. Department of Nuclear Medicine, Institute of Oncology "Prof Dr I Chiricuta", Cluj-Napoca, Romania. 3. Department of Oncology, Institute of Oncology "Prof Dr I Chiricuta", Cluj-Napoca, Romania.