The prevalence and characterization of self-medication for obtainning pain relief among undergraduate nursing students - Souza, Layz Alves Ferreira; Silva, Camila Damázio da; Ferraz, Gisely Carvalho; Sousa, Fatima Aparecida Emm Faleiros; Pereira, Lílian Varanda (Revista Latino-Americana de Enfermagem, 2011)