2020 - 28th AM - Session I: Updates in epidemiology, lecture 1 "Methodological bias in epidemiological studies" 2020 - 28th AM - Session I: Updates in epidemiology, lecture 2 "Investigating the environmental risk factors: the lesson from Parkinson disease" 2020 - 28th AM - Session I: Updates in epidemiology, lecture 3 "Geographic distribution of MS and migration studies" 2020 - 28th AM - Session I: Updates in epidemiology, lecture 4 "Gene environment interactions in MS"