The search was conducted in the following computerized databases during February 2013: PubMed http://www.pubmed.gov, Cochrane Controlled Trials Register Central, The Cochrane Library - http://www.thecochranelibrary.com.br, Embase http://www.embase.com, and Lilacs http://lilacs.bvsalud.org.
La búsqueda se hizo en febrero de 2013 en las bases de datos informatizadas PubMed http://www.pubmed.gov, Cochrane Controlled Trials Register Central, The Cochrane Library -http://www.thecochranelibrary.com.br, Embase http://www.embase.com y Lilacs http://lilacs.bvsalud.org.
A busca foi feita em fevereiro de 2013, nas bases de dados computadorizadas PubMed http://www.pubmed.gov, Cochrane Controlled Trials Register Central, The Cochrane Library -http://www.thecochranelibrary.com.br, Embase http://www.embase.com e Lilacs http://lilacs.bvsalud.org.