Javier García-Pérez*, Elena Boldo, Rebeca Ramis, Marina Pollán, Beatriz Pérez-Gómez, Nuria Aragonés and Gonzalo López-Abente
* Corresponding author: Javier García-Pérez jgarcia@isciii.es
BMC Public Health 2007, 7:40 doi:10.1186/1471-2458-7-40
