1. Department of Physical Therapy, Universidade Federal de Pernambuco, Recife, Brazil.
2. Grupo de Fisica Nuclear, Facultad de Ciencias Fisicas, Universidad Complutense de Madrid, Madrid, Spain.
3. Nuclear Department, Universidade Federal de Pernambuco, Recife, Brazil.
4. Georgia State University, Atlanta, Georgia.
5. Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts.