Evaluating the Knowledge and Information-Seeking Behaviors of People Living With Multiple Sclerosis: Cross-Sectional Questionnaire Study - Véronique Duguay; Dominique Comeau; Tiffany Turgeon; Nadia Bouhamdani; Mathieu Belanger; Lyle Weston; Tammy Johnson; Nicole Manzer; Melissa Giberson; Ludivine Chamard-Witkowski (Journal of Medical Internet Research)