1. Department of Physical Medicine and Rehabilitation, University of Lisbon Medical School, Santa Maria Hospital, Lisbon, Portugal.
2. Neuromuscular Unit, Institute of Molecular Medicine, University of Lisbon Medical School, Lisbon, Portugal.
3. Linde Sogás Co., The Linde Group, Lisbon, Portugal.
4. Department of Neurology, University of Lisbon Medical School, Santa Maria Hospital, Lisbon, Portugal.