RETRACTED: Influence of aging on lidocaine requirements for pain on injection of propofol

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief, Dr. Robert R. Gaiser. The University of Toho, where Dr. Fujii was employed, determined that the integrity of the published data could not be verified or substantiated. See: http://www.toho-u.ac.jp/english/information/march_6_2012.html.