- Correspondence to Professor Dr Luis Miguel Borrego, Departamento de Imunologia, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Campo dos Mártires da Pátria 123, Lisboa 1150–227, Portugal;
- Received February 9, 2012
- Revised October 1, 2012
- Accepted November 27, 2012
- First published January 3, 2013.
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