1. Department of NeurologyColumbia University Medical CenterNew YorkNew YorkUSA
2. Department of NeuropediatricsCharité Virchow University HospitalBerlinGermany
3. Servizio di Genetica Clinica ed EpidemiologicaDepartment of PediatricsUniversity of PadovaPadovaItaly
4. Centro Andaluz de Biología del Desarrollo and Centro de Investigación Biomédica en Red: Enfermedades RarasInstituo de Salud Carlos IIIUniversidad Pablo de Olavide‐CSICSevillaSpain