- Correspondence to Professor Sílvia Ferreira de Sousa, Department of Dentistry, Biological Sciences and Health Institute, Universidade Federal de Sergipe, Rua Cláudio Batista, Aracaju, CEP 49.060-108, Brazil;
- Received 28 September 2017
- Revised 16 October 2017
- Accepted 22 October 2017
- Published online 10 November 2017.
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