- Correspondence to Professor Henrique Manuel Gil Martins, Centro de Investigação e Criatividade em Informática, Hospital Professor Doutor Fernando Fonseca, IC 19—Venteira, Amadora, Lisboa 2720-276, Portugal;
- Received July 20, 2012
- Revised December 14, 2012
- Accepted December 19, 2012
- First published January 23, 2013.
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