- Correspondence to Dr Julián Benito-León, Avda. de la Constitución 73, portal 3, 7° Izquierda, Coslada, Madrid E-28821, Spain;
- Received 12 March 2012
- Published in print 1 June 2013.
- Published online 8 May 2013.
- Published first 13 March 2013.
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