- Correspondence to: Dr K Jáuregui-Renaud Unidad de Investigación Medica, HG Centro Medico Nacional La Raza, IMSS, Av Vallejo y Jacarandas Colonia La Raza, CP 02990, Mexico;
- Received 5 July 2005
- Accepted 2 February 2006
- Revised 1 February 2006
- Published in print 1 June 2006.
- Published online 16 May 2006.
- Published first 7 February 2006.
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