Accepted for Publication: May 10, 2011.
Author Contributions: Study concept and design: Schuetz, Greenwald, and Chiappa. Acquisition of data: Schuetz, Greenwald, Chiappa, and Briel. Analysis and interpretation of data: Schuetz, Greenwald, Chiappa, and Briel. Drafting of the manuscript: Schuetz and Greenwald. Critical revision of the manuscript for important intellectual content: Schuetz, Greenwald, Chiappa, and Briel. Statistical analysis: Schuetz and Briel.
Financial Disclosure: Dr Schuetz was supported by research grant PASMP3-127684/1 from the Swiss Foundation for Grants in Biology and Medicine and received support from BRAHMS USA Inc and bioMérieux to attend meetings and to fulfill speaking engagements. Dr Briel is supported by grants from santésuisse and the Gottfried and Julia Bangerter-Rhyner Foundation.
Additional Contributions: Qing Wang, PhD, of the Basel Institute for Clinical Epidemiology, University Hospital Basel, Switzerland, helped with the translation of an article published in Chinese. Carole Foxman, MA, MS, Coordinator for Education and Database Services/Research Liaison at the Treadwell Library, Massachusetts General Hospital, assisted with the EMBASE and Cochrane Central Register of Controlled Trials database searches.
This article was corrected for typographical errors on August 18, 2011.