Assessment of Suspected Insulinoma by 48-hour Fasting Test: A Retrospective Monocentric Study of 23 Cases - Quinkler, M; Strelow, F; Pirlich, M; Rohde, W; Biering, H; Lochs, H; Gerl, H; Strasburger, C J; Ventz, M (Hormone and Metabolic Research, 2007)