RETRACTED: Sedation and anesthesia in GI endoscopy

This article has been retracted at the request of the Editor-in-Chief. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).Reason: This article contains some duplicate material of a paper that was originally published in Gastroenterology, 133 (2007) 675–701, doi:10.1053/j.gastro.2007.06.002.One of the conditions of submission of a paper for publication is that authors declare explicitly that all of their work is original and has not appeared in a publication elsewhere. We apologize to readers of the journal that this was not detected during the submission process.