1 Department of Neurology, Mellen Center for Multiple Sclerosis Treatment and Research, Cleveland Clinic Foundation, Cleveland, OH, USA/Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, OH, USA [email protected].
2 Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, OH, USA/Department of Medicine, Case Western Reserve University, Cleveland, OH, USA/Center for Health Care Research & Policy, MetroHealth Medical Center, Cleveland, OH, USA.