1. CISP – Public Health Research Center, NOVA National School of Public Health, Lisbon, Portugal
2. Comprehensive Health Research Center (CHRC), Lisbon, Portugal
3. Clinical Investigator, Occupational Doctor, Lisbon, Portugal
4. Unidad de la Espalda Kovacs. Hospital Universitario HLA-Moncloa, y Red Española de Investigadores en Dolencias de la Espalda, Madrid, Spain