- Correspondence to: Julia del Amo Departamento de Salud Publica, Universidad Miguel Hernandez, Campus de San Juan, Crtra Alicante-Valencia Km.87, 03550 San Juan-Alicante, Spain;
- Accepted February 5, 2004
- First published January 28, 2005.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.