The MSAA (Multiple Sclerosis Association of America) has produced a 2015 summary of research in MS that could be very helpful and appears to be quite comprehensive.
You can see it here. These are the people who produced it:
Written and compiled by Stephen Krieger, MD
Includes material by Margaret M. McCormick, RN, BSN, MSCN and Diana Schneider, PhD
Reviewed by Jack Burks, MD | Edited by Susan Wells Courtney