[1] Univ North Texas, Dept Rehabil & Hlth Serv, Denton, TX USA
[2] David Geffen Sch Med, Dept Neurol, Los Angeles, CA USA
[3] Vet Adm Greater Los Angeles Hlth Care Syst, Parkinsons Dis Res Educ & Clin Ctr PADRECC, Los Angeles, CA USA
[4] Skypass Fdn, Irving, TX USA
[5] Univ Texas Southwestern Med Ctr, Dept Neurol, Dallas, TX USA
[6] Univ North Texas, 1155 Union Circle 311456, Denton, TX 76203 USA