[1] Leiden Univ, Inst Psychol Hlth Med, POB 9555, NL-2300 RB Leiden, Netherlands
[2] Leiden Univ, Neuropsychol Unit, POB 9555, NL-2300 RB Leiden, Netherlands
[3] Natl Multiple Sclerosis Fdn, Mathenesserlaan 378, NL-3023 HB Rotterdam, Netherlands
[4] Elisabeth TweeSteden Hosp, Dept Neurol, POB 90151, NL-5000 LC Tilburg, Netherlands
[5] Univ Humanist Studies, Dept Care Eth, POB 797, NL-3500 AT Utrecht, Netherlands
[6] MS4 Res Inst, Ubbergseweg 34, NL-9522 KJ Nijmegen, Netherlands
[7] Univ Groningen, Univ Med Ctr Groningen, Dept Community & Occupat Med, POB 30001, NL-9700 RB Groningen, Netherlands
[8] Tilburg Univ, Tilburg Sch Social & Behav Sci, Tranzo Sci Ctr Care & Welf, POB 90153, NL-5000 LE Tilburg, Netherlands
[9] Med Ctr Leeuwarden, Dept Neurol, POB 888, NL-8901 BR Leeuwarden, Netherlands
[10] Jeroen Bosch Hosp, Dept Neurol, POB 90153, NL-2000 ME sHertogenbosch, Netherlands
[11] St Antonius Hosp, Dept Neurol, POB 2500, NL-3430 EM Nieuwegein, Netherlands
[12] Northwest Clin Alkmaar, Dept Neurol, Postbus 501, NL-1800 AM Alkmaar, Netherlands
[13] Catharina Hosp, Dept Neurol, POB 1350, NL-5602 ZA Eindhoven, Netherlands
[14] Alrijne Hosp Leiden, Dept Neurol, POB 9650, NL-2300 RD Leiden, Netherlands
[15] Rijnstate Hosp, Dept Neurol, POB 9555, NL-6800 TA Arnhem, Netherlands
[16] Canisius Wilhelmina Hosp, Dept Neurol, POB 9015, NL-6500 GS Nijmegen, Netherlands
[17] Groene Hart Hosp, Dept Neurol, POB 1098, NL-2800 BB Gouda, Netherlands
[18] Albert Schweitzer Hosp, Dept Neurol, POB 444, NL-3300 AK Dordrecht, Netherlands
[19] Leiden Univ, Med Ctr, Dept Neurol, POB 9600, NL-2300 RC Leiden, Netherlands