Title:The Classification of Causes of Historical Mortality (CCHM): A proposal of the study of death records / La Clasificación de Causas de Mortalidad Histórica (CCMH): una propuesta de estudio de registros de defunción
Title:Prevalence and associated factors of the use of opioids in the treatment of chronic non-cancer pain. Perspective of the general Spanish population and the experience of patients.