tokens: ROC curve analysis revealed that unresponsiveness to verapamil defined as PRL < 7 % , discriminated anatomical or functional stalk effect ( sensitivity : 74 % , specificity : 73 % , AUC : 0 . 855 + / - 0 . 04 , P < 0 . 001 , CI : 0 . 768 - 0 . 942 ) associated with pseudoprolactinoma or risperidone - induced hyperprolactinemia , respectively .