Department of Medicine;
St.John Hospital and Medical Center;
Detroit;
MI 48236;
United States;
Department of Surgery;
St.John Hospital and Medical Center;
Detroit;
MI 48236;
United States;
Division of Gastroenterology;
Department of Medicine;
St.John Hospital and Medical Center;
Detroit;
MI 48236;
United States;
Division of Digestive Diseases;
Columbia University Medical Center;
New York;
NY 10032;
United States;
Insulinoma; Endosonography; Endoscopic; ultrasound-guided; fine-needle; tattooing; Pancreas; Neuroendocrine; tumors;