1. Polytechnic Institute of Coimbra, ESTeSC Coimbra Health School, Physiotherapy Department, Rua 5 de Outubro, S. Martinho do Bispo, Apartado 7006 3046-854 Coimbra, Portugal. Tel.: +351 239 802 430; Fax: +351 239 813 395; E-mail: anabelacmartins@estescoimbra.pt