1. Department of General Surgery University Clinical Hospital Virgen de la Arrixaca Murcia Spain
2. Department of General Surgery University Hospital Reina Sofia Murcia Spain
3. Department of Maxillofacial Surgery University Clinical Hospital Virgen de la Arrixaca Murcia Spain
4. Endocrine Surgery Unit, Department of General Surgery General University Hospital Santa Lucía Cartagena Spain
5. Endocrine Surgery Unit, Department of General Surgery Getafe University Hospital Getafe Spain
6. Endocrine Surgery Unit, Department of General Surgery Consorci Parc de Salut Mar de Barcelona Barcelona Spain
7. Endocrine Surgery Unit, Department of General Surgery University Clinical Hospital Virgen de la Arrixaca Murcia Spain