Lambert-Eaton myasthenic syndrome in a 13-year-old girl with Xp11.22-p11.23 duplication. - Verbeek S; Vanakker O; Mercelis R; Lipka AF; Haerynck F; Dullaers M; Verloo P; Van Coster R; Verhelst H (European journal of paediatric neurology : EJPN : official journal of the European Paediatric Neurology Society, 2014)