1. Federal University of Rio Grande do Norte; Department of Physical Therapy; Avenida Senador Salgado Filho 3000, Bairro Lagoa Nova Natal Rio Grande do Norte Brazil 59078-970
2. University College London; Department of Epidemiology and Public Health; Royal Free and University College Medical School 2-16 Torrington Place London UK WC1E 6BT
3. Federal University of Rio Grande do Norte; PhD Program in Physical Therapy; Avenida Senador Salgado Filho, 3000 Bairro Lagoa Nova Natal Rio Grande do Norte Brazil 59078-970