The Real-World Experiences of Persons With Multiple Sclerosis During the First COVID-19 Lockdown: Application of Natural Language Processing - Deborah Chiavi; Christina Haag; Andrew Chan; Christian Philipp Kamm; Chloé Sieber; Mina Stanikić; Stephanie Rodgers; Caroline Pot; Jürg Kesselring; Anke Salmen; Irene Rapold; Pasquale Calabrese; et al. (JMIR Medical Informatics, 2022)