ABCD1 and hereditary spastic paraplegia: 15 patients with HSP (mean age 43.7 ± 10.6 years; 5 women and 10 men; AMN: 6 patients with ABCD1 gene variants; HSP: 1 patient with HSP3A, 1 with HSP7, 5 with unspecified HSP pure, and 2 with unspecified HSP complex variants)