[1] Grupo I-Saúde (Instituto de Investigación Sanitaria Galicia Sur),Vigo Teaching Unit of Family and Community Medicine and Nursing, EOXI Vigo, Galician Health Service, RedIAPP
[2] Grupo I-Saúde (Instituto de Investigación Sanitaria Galicia Sur),Quality and Research Unit, Primary Care, EOXI Vigo, Galician Health Service, RedIAPP
[3] Grupo I-Saúde (Instituto de Investigación Sanitaria Galicia Sur),Ourense Health Center, EOXI Ourense, Galician Health Service, RedIAPP
[4] Grupo I-Saúde (Instituto de Investigación Sanitaria Galicia Sur),Sárdoma Health Center, EOXI Vigo, Galician Health Service, RedIAPP
[5] Galician Health Service,Fontenla
[6] Universidad de Santiago de Compostela,Maristany Health Center, EOXI Ferrol
[7] Instituto de Investigación Sanitaria Santiago de Compostela,Epidemiology Department, EOXI Santiago de Compostela
[8] EOXI A Coruña,Clinical Epidemiology and Biostatistics Unit