Expression of HIF-1a, HIF-2a (EPAS1), and their target genes in paraganglioma and phaeochromocytoma with VHL and SDH mutations - Pollard, P; El-Bahrawy, M; Poulsom, R; Killick, P; Latif, F; Hodgson, S; Tomlinson, I; Maher, E (2006)