1. Endocrine and Breast Surgery Unit, Department of General and Digestive Surgery, Instituto de Investigación, Hospital Universitario La Paz (IdiPAZ) , Madrid , Spain
2. Endocrine and Breast Surgery Unit, Department of Surgery, Hospital Universitario Ramón y Cajal , Madrid , Spain
3. Endocrine Surgery Unit, Department of Surgery, Hospital Universitario Gregorio Marañón , Madrid , Spain
4. Endocrine Surgery Unit, Department of Surgery, Hospital Universitario Cruces , Bilbao , Spain
5. Endocrine and Breast Surgery Unit, Department of Surgery, Hospital Universitario La Princesa , Madrid , Spain
6. Endocrine and Breast Surgery Unit, Department of Surgery, Hospital Universitario Virgen de la Arreixaca , Murcia , Spain
7. Pathology department, Hospital Universitario Ramon y Cajal , IRYCIS, Madrid , Spain . CIBERONC