- Correspondence to Professor Mamede de Carvalho, Faculty of Medicine, Instituto de Medicina Molecular, Institute of Physiology, University of Lisbon, Av. Professor Egas Moniz, Lisbon 1648-028, Portugal;
- Received November 10, 2012
- Revised January 13, 2013
- Accepted January 23, 2013
- First published February 16, 2013.
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