title: Motor amplitude measurement errors--foiled by a millimeter ruler.
mesh_terms: D000200:Action Potentials; D004558:Electric Stimulation; D004576:Electromyography / Q000592:standards*; D006801:Humans; D009046:Motor Neurons / Q000502:physiology*; D009132:Muscles / Q000294:innervation / Q000502:physiology*; D010543:Peroneal Nerve / Q000502:physiology; D014459:Ulnar Nerve / Q000502:physiology