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Federação Brasileira de Gastroenterologia; Sociedade Brasileira de Endoscopia Digestiva; Colégio Brasileiro de Cirurgia Digestiva; Sociedade Brasileira de Pneumologia; Associação Brasileira de Otorrinolaringologia; Cirurgia Cérvico-Facial.Federação Brasileira de Gastroenterologia, et al.Rev Assoc Med Bras (1992). 2012 Jan-Feb;58(1):18-24; quiz 25. doi: 10.1590/s0104-42302012000100009.Rev Assoc Med Bras (1992). 2012.PMID: 22392311Free article.Portuguese.No abstract available.