[1] UCL, Inst Neurol, Queen Sq Multiple Sclerosis Ctr, London, England
[2] Univ Autonoma Barcelona, Hosp Univ Vall Hebron, Sect Neuroradiol, Dept Radiol, Barcelona, Spain
[3] UCL, Dept Med Phys & Biomed Engn, Ctr Med Image Comp CMIC, London, England
[4] Univ Oberta Catalunya, Ctr Hlth, Barcelona, Spain
[5] Univ Coll London Hosp UCLH, Natl Inst Hlth Res NIHR, London, England
[6] Multiple Sclerosis Ctr Catalonia Cemcat, Dept Neurol, Vall dHebron Barcelona Hosp Campus, Barcelona, Spain
[7] Vrije Univ Amsterdam, Radiol Nucl Med, Med Ctr, Amsterdam, Netherlands