“…PTHrP Ito et al, 1993), neuromedin B (Hearn et al, 1992), calcitonin gene-related peptide (CGRP) (Cohen et al, 1994), renin (Mizuno et al, 1986), and PACAP receptors (Robberecht et al, 1993) have also been documented, but only the study of larger series of cases will allow their role to be elucidated.…”