1 Department of Neurology, Oslo University Hospital, 0424 Oslo, Norway; The Norwegian Air Ambulance Foundation, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway. Electronic address: else@sandset.net.
2 Centro Hospitalar Universitário Lisboa Central-ULS São José, Lisbon, Portugal; Instituto de Anatomia and CEEM, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal; Lopes Lab, Gulbenkian Institute of Molecular Medicina, Lisbon, Portugal.