“Determination of Vitamin D Serum Levels in Patients Diagnosed With Multiple Sclerosis and Their Relationship With the Severity and Illness Behavior in the Metropolitan Hospital in Quito and Carlos Andrade Marín Hospital”. 2016. Medical-Scientific Journal CAMbios HECAM 15 (1): 52-55. https://doi.org/10.36015/cambios.v15.n1.2016.199.