Sebastien Bailly is a researcher at the French National Center for Medical Research (INSERM). He is graduated as Pharm D in 2015 and a PhD as a biostatistician and methods in medical research in 2015 (Grenoble Alpes University). His field of research is applied methods in observational longitudinal medical including causal inference methods, longitudinal clustering, hidden Markov models, etc. which are applied in chronic diseases trajectories. He work on various databases, including national and international databases on sleep apnea.