van der Linden, FAH;    Kragt, JJ;    van Bon, M;    Klein, M;    Thompson, AJ;    van der Ploeg, HM;    Polman, CH;           van der Linden, FAH;  Kragt, JJ;  van Bon, M;  Klein, M;  Thompson, AJ;  van der Ploeg, HM;  Polman, CH;  Uitdehaag, BMJ;   - view fewer <#>    (2008)    Longitudinal proxy measurements in multiple sclerosis: patient-proxy agreement on the impact of MS on daily life over a period of two years.                   BMC Neurology , 8     , Article 2.  10.1186/1471-2377-8-2 <https://doi.org/10.1186/1471-2377-8-2>.       Green open access