@inbook{1135230261, author={Robert T. Jensen}, editor={Longo, Dan L.}, title={Endocrine Tumors of the Gastrointestinal Tract and Pancreas}, booktitle={Harrison's Hematology and Oncology, 3e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2016}, url={hemonc.mhmedical.com/content.aspx?aid=1135230261} }