Association of Group A Streptococcus Exposure and Exacerbations of Chronic Tic Disorders: A Multinational Prospective Cohort Study.

Martino D, Schrag A, Anastasiou Z, Apter A, Benaroya-Milstein N, Buttiglione M, Cardona F, Creti R, Efstratiou A, Hedderly T, Heyman I, Huyser C, Madruga M, Mir P, Morer A, Debes NM, Moll N, Müller N, Müller-Vahl K, Munchau A, Nagy P, Plessen KJ, Porcelli C, Rizzo R, Roessner V, Schnell J, Schwarz M, Skov L, Steinberg T, Tarnok Z, Walitza S, Dietrich A, Hoekstra PJ; EMTICS Collaborative Group.