Medtronic Keypoint (Medtronic Inc., Skovlunde, Denmark) was used for electromyographic examinations, and Magpro (Medtronic Inc.) was used for magnetic stimulation. MEP was measured in the first dorsal interossei (FDI), biceps brachii (BB) and deltoid (Del). The international 10-20 system was used for mapping the locations of stimulation. The optimal stimulation coordinate was selected if MEP of 50 µV or more was induced at least 5 times from over 10 stimulations at the lowest excitation threshold. Latency and amplitude were obtained by averaging the values from four stimulations at 120% of excitation threshold at the optimal stimulation coordinate. Central motor conduction time (CMCT) was defined as the difference between MEP latency and MEP latency induced from cervical magnetic stimulation [19 (link)]. We used normal values of healthy adults reported in previous studies as reference [20 (link)].