title: Reply to Penelope A. McNulty and Emma F. Hodson-Tole.
authors.affiliation: Institute of Neurology, Università Cattolica del Sacro Cuore, Rome, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Granata
authors.affiliation: Institute of Neurology, Campus Bio-Medico University, Rome, Italy.
authors.forename: Federica
authors.initials: F
authors.lastname: Giambattistelli
authors.affiliation: Institute of Neurology, Università Cattolica del Sacro Cuore, Rome, Italy; Don Gnocchi Foundation, Milan, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Padua
authors.affiliation: Don Gnocchi Foundation, Milan, Italy; Board of Physical Medicine and Rehabilitation, Department of Orthopaedic Science, "Sapienza" University, Rome, Italy. Electronic address: danielecoraci@aol.com.
authors.forename: Daniele
authors.initials: D
authors.lastname: Coraci
authors.affiliation: Laboratory of Biomedical Robotics and Biomicrosystems, Campus Bio-Medico University, Rome, Italy.
authors.forename: Francesco M
authors.initials: FM
authors.lastname: Petrini
mesh_terms: D006801:Humans; D013564:Sympathetic Nervous System / Q000000981:diagnostic imaging* / Q000502:physiology*; D014463:Ultrasonography