1 Interdisciplinary Centre for the Study of Human Performance (CIPER), Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Lisbon, Portugal.
2 Department of Biomedical Engineering, Healthcare Engineering Innovation Center (HEIC), Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates.
3 Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece.