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An international survey indicated that unpublished systematic reviews exist.
Tricco AC, Pham B, Brehaut J, Tetroe J, Cappelli M, Hopewell S, Lavis JN, Berlin JA, Moher D. Tricco AC, et al. Among authors: pham b. J Clin Epidemiol. 2009 Jun;62(6):617-623.e5. doi: 10.1016/j.jclinepi.2008.09.014. Epub 2009 Jan 21. J Clin Epidemiol. 2009. PMID: 19162440
Should meta-analysts search Embase in addition to Medline?
Sampson M, Barrowman NJ, Moher D, Klassen TP, Pham B, Platt R, St John PD, Viola R, Raina P. Sampson M, et al. Among authors: pham b. J Clin Epidemiol. 2003 Oct;56(10):943-55. doi: 10.1016/s0895-4356(03)00110-0. J Clin Epidemiol. 2003. PMID: 14568625
579 results