Jaworski , Jacek, Marek Psujek, Marzena Janczarek, Małgorzata Szczerbo-Trojanowska, and Halina Bartosik-Psujek. 2012. “Total-Tau in Cerebrospinal Fluid of Patients With Multiple Sclerosis Decreases in Secondary Progressive Stage of Disease and Reflects Degree of Brain Atrophy”. Upsala Journal of Medical Sciences 117 (3). https://doi.org/10.3109/03009734.2012.669423.