Department of Nuclear Medicine and PET/CT Centre, Oncology Institute of Southern Switzerland, Bellinzona, Switzerland; EOC Competence Centre for Thyroid Diseases, Oncology Institute of Southern Switzerland, Bellinzona, Switzerland. Electronic address: luca.giovanella@eoc.ch. Department of Nuclear Medicine and PET/CT Centre, Oncology Institute of Southern Switzerland, Bellinzona, Switzerland; EOC Competence Centre for Thyroid Diseases, Oncology Institute of Southern Switzerland, Bellinzona, Switzerland.