Jose R Yuste1, Juan Buades2, Edgar F Guillen3, Isabel Vivas4. 1. Department of Internal Medicine, Clinica Universidad de Navarra, Pamplona, Spain. Electronic address: jryuste@unav.es. 2. Department of Internal Medicine, Clinica Universidad de Navarra, Pamplona, Spain. 3. Department of Nuclear Medicine, Clinica Universidad de Navarra, Pamplona, Spain. 4. Department of Radiology, Clinica Universidad de Navarra, Pamplona, Spain.