Sonia Tamames* , Alberto Perez Rubio* , Javier Castrodeza Sanz* , Maria Belen Canton Alvarez* , Francisco J Luquero* , Sara Santos Sanz , Placido Lopez Encinar , Maria Paz de la Torre Pardo and Juan Manuel Gil Gonzalez
BMC Health Services Research 2007, 7:187doi:10.1186/1472-6963-7-187