1. Department of Surgery and Anatomy, Faculty of Medicine of Ribeirão Preto, University of São Paulo (USP), SP, Brazil.
2. Department of Physics and Science of Materials, Institute of Physics of São Carlos, University of São Paulo (USP), SP, Brazil.
3. Permanent address: Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba (UNIVAP), Urbanova 12244-000, São José dos Campos, SP, Brazil.
4. Department of Medical Clinic, Faculty of Medicine of Ribeirão Preto, University of São Paulo (USP), SP, Brazil.