- Correspondence to Ana Isabel Ribeiro, Instituto de Engenharia Biomédica—INEB, Universidade do Porto, Rua do Campo Alegre, 823, Porto 4150-180, Portugal;
- Received October 17, 2015
- Revised December 10, 2015
- Accepted December 11, 2015
- First published February 15, 2016.
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