The studies were electronically found through five databases: Medical Literature Analysis and Retrieval System Online MEDLINE from 1948 to 2014, Excerpta Medica Database EMBASE from 1974 to 2014, Cumulative Index to Nursing and Health Literature CINAHL from 1982 to 2014, Literatura Latino-Americana e do Caribe em Ciências da Saúde LILACS/Scientific Electronic Library Online SciELO from 1982 to 2014, Cochrane Central Register of Controlled Trials CENTRAL in The Library.
Los estudios fueron identificados electrónicamente, por medio de cinco bases de datos: 1 Medical Literature Analysis and Retrie6val System Online MEDLINE de 1948 hasta 2014, 2 Excerpta Medica Database EMBASE de 1974 hasta 201, 3 Cumulative Index to Nursing and Health Literature CINAHL de 1982 hasta 2014, 4 Literatura Latinoamericana y del Caribe en Ciencias de la Salud LILACS/Scientific Electronic Library Online SciELO de 1982 hasta 2014, y 5 Cochrane Central Register of Controlled Trials CENTRAL en The Cochrane Library.
Os estudos foram identificados eletronicamente, por meio de cinco bases de dados: Medical Literature Analysis and Retrieval System Online MEDLINE de 1948 até 2014, Excerpta Medica Database EMBASE de 1974 até 201 Cumulative Index to Nursing and Health Literature CINAHL de 1982 até 2014, Literatura Latino-Americana e do Caribe em Ciências da Saúde LILACS/Scientific Electronic Library Online SciELO de 1982 até 2014, Cochrane Central Register of Controlled Trials CENTRAL em The Cochrane Library.