1. Endocrine and Advanced Laparoscopic Surgery Service, Department of Surgery, National Institute of Medical Sciences and Nutrition Salvador Zubirán, Mexico City, Mexico.
2. Department of Radiology, National Institute of Medical Sciences and Nutrition Salvador Zubirán, Mexico City, Mexico.
3. Department of Anatomical Pathology, and National Institute of Medical Sciences and Nutrition Salvador Zubirán, Mexico City, Mexico.
4. Department of Endocrinology and Metabolism, National Institute of Medical Sciences and Nutrition Salvador Zubirán, Mexico City, Mexico.