Neurological Research Unit, Hospital Nacional de Parapléjicos, Toledo, Spain, 4Unit
of Pain, Hospital Severo Ochoa, Leganés, Spain, 5INSERM U-792, Hôpital Ambroise Paré, Boulogne-Billancourt, F-92100 France, 6Université Versailles-Saint-Quentin, Versailles F-78035, France, 7Department
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