Adult hyperinsulinemic hypoglycemia not caused by an insulinoma: a report of two cases. - van der Wal,B.C.; de Krijger,R.R.; de Herder,W.W.; Kwekkeboom,D.J.; van der Ham,F.; Bonjer,H.J.; van Eijck,C.H. (Virchows Arch, 2000)