Insulinoma and islet cell hyperplasia: value of the calcium intraarterial stimulation test when findings of other preoperative studies are negative - Pereira,P.L.; Roche,A.J.; Maier,G.W.; Huppert,P.E.; Dammann,F.; Farnsworth,C.T.; Duda,S.H.; Claussen,C.D. (Radiology, 1998)