Fine-needle aspiration biopsy of pancreatic neuroendocrine tumors: Correlation between Ki-67 index in cytological samples and clinical behavior

1. Díaz del Arco, C.
2. Esteban López-Jamar, J.M.
3. Ortega Medina, L.
4. Díaz Pérez, J.Á.
5. Fernández Aceñero, M.J.