Muscle and not neuronal biomarkers correlate with severity in spinal and bulbar muscular atrophy by Lombardi, V, Querin, G, Ziff, O, Zampedri, L, Martinelli, I, Heller, C, Foiani, M, Bertolin, C, Lu, C, Malik, B, Allen, K, Rinaldi, C, Zetterberg, H, Heslegrave, A, Greensmith, L, Hanna, M, Soraru, G, Malaspina, A, Fratta, P