Study protocol: improving cognition in people with progressive multiple sclerosis: a multi-arm, randomized, blinded, sham-controlled trial of cognitive rehabilitation and aerobic e... oleh Anthony Feinstein, Maria Pia Amato, Giampaolo Brichetto, Jeremy Chataway, Nancy Chiaravalloti, Ulrik Dalgas, John DeLuca, Peter Feys, Massimo Filippi, Jennifer Freeman, Cecilia Meza, Matilde Inglese, Robert W. Motl, Maria Assunta Rocca, Brian M. Sandroff, Amber Salter, Gary Cutter, On behalf of the CogEx Research Team