1. Department of Cell Biology, Erasmus Medical Centre, Rotterdam, The Netherlands, Laboratório de Proteómica, Departamento de Genética, Instituto Nacional de Saúde Dr Ricardo Jorge, Lisboa, Portugal, Department of Biochemistry, Erasmus University Medical Centre, Rotterdam, The Netherlands, Institut für Arbeitsmedizin und Sozialmedizin Universitätsklinikum Aachen, and Department of Neurology, Erasmus Medical Centre, Rotterdam, The Netherlands