1. Department of Nuclear Medicine, State Institute of Diabetes and Endocrinology (IEDE), Rio de Janeiro, Brazil.
2. Department of Medical Physics, Institute of Radiation Protection and Dosimetry, National Nuclear Energy Commission (IRD/CNEN), Rio de Janeiro, Brazil.
3. Department of Radiology, University Hospital of the Federal University of Rio de Janeiro (HUCFF/UFRJ), Rio de Janeiro, Brazil.