polysomnography Aged 6 Female 6 Humans 6 Male 6 Middle Aged 6 Polysomnography 6 adult 6 aged 6 female 6 human 6 male 6 priority journal 6 Adolescent 4 Adult 4 Magnetic Resonance Imaging 4 Syringomyelia 4 adolescent 4 article 4 clinical article 4 controlled study 4 syringomyelia 4 Arnold-Chiari Malformation 2 Basal Ganglia 2 Brain 2 Cerebral Cortex 2 Chiari Frommel syndrome 2 Electromyography 2 Medulla Oblongata 2 Motor Neurons 2