1. Department of Angiology and Vascular Surgery, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
2. Department of Surgery and Physiology, Cardiovascular Investigation Unit, Faculdade de Medicina da Universidade do Porto, Porto, Portugal
3. Department of Angiology and Vascular Surgery, Centro Hospitalar São João, Porto, Portugal
4. Department of Angiology and Vascular Surgery, Centro Hospitalar Tâmega e Sousa, Penafiel, Portugal