1 Endocrine Surgery Unit, Department of General and Digestive Surgery, Instituto de Investigación Hospital Universitario La Paz (IdiPAZ), Madrid, Spain. Electronic address: jgomezramirez@hotmail.com.
2 Endocrine Surgery Unit, Department of General and Digestive Surgery, Instituto de Investigación Hospital Universitario La Paz (IdiPAZ), Madrid, Spain.