There were no significant differences at pretreatment between the Study 1 groups on any of the characteristics listed in Table 2 in the online-only data supplement (P, range=0.16-.36), including expectation of benefit from treatment (P=0.20). Nor were there pretreatment differences on the Motor activity log (P=0.92; see Supplemental Table 3) or wolf motor function test(P=0.74; see Supplemental Table 4).