BIOMED, School of Life Sciences, Hasselt University, 3590 Diepenbeek, Belgium. winde.jorissen@uhasselt.be. BIOMED, School of Life Sciences, Hasselt University, 3590 Diepenbeek, Belgium. tim.vanmierlo@uhasselt.be. REVAL Rehabilitation Research Center, BIOMED Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, 3590 Diepenbeek, Belgium. inez.wens@uhasselt.be. BIOMED, School of Life Sciences, Hasselt University, 3590 Diepenbeek, Belgium. veerle.somers@uhasselt.be. Revalidation and MS Center, 3900 Overpelt, Belgium. bart.vanwijmeersch@uhasselt.be. BIOMED, School of Life Sciences, Hasselt University, 3590 Diepenbeek, Belgium. jeroen.bogie@uhasselt.be. Clinical Center, Department of Laboratory Medicine, National Institutes of Health Clinical Center (NIH), Bethesda, MD 20814, USA. Alan.Remaley@nih.gov. REVAL Rehabilitation Research Center, BIOMED Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, 3590 Diepenbeek, Belgium. bert.opteijnde@uhasselt.be. BIOMED, School of Life Sciences, Hasselt University, 3590 Diepenbeek, Belgium. jerome.hendriks@uhasselt.be.