The Prevalence of Cancer in Patients with Multiple Sclerosis (MS) who were Under Treatment with Natalizumab (Tysabri): A Systematic Review and Meta-Analysis. - Nasirzadeh, Amirreza; Jahanshahi, Reza; Ghajarzadeh, Mahsa; Mohammadi, Aida; Sahraian, Mohammad Ali; Moghadasi, Abdorreza Naser (International Journal of Preventive Medicine, 2023)