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\section{Methods}  \subsection{2.1} \subsection{}  Search Criteria   We conducted a PubMed search using the following search string:  (((((("Journal of clinical oncology : official journal of the American Society of Clinical Oncology"[Journal] OR "Nature reviews. Cancer"[Journal]) OR "Cancer research"[Journal]) OR "The Lancet. Oncology"[Journal]) OR "Clinical cancer research : an official journal of the American Association for Cancer Research"[Journal]) OR "Cancer cell"[Journal]) AND ("2007/01/01"[PDAT] : "2015/12/31"[PDAT]) AND "humans"[MeSH Terms]) AND (((meta-analysis[Title/Abstract] OR meta-analysis[Publication Type]) OR systematic review[Title/Abstract]) AND ("2007/01/01"[PDAT] : "2015/12/31"[PDAT]) AND "humans"[MeSH Terms]) AND (("2007/01/01"[PDAT] : "2015/12/31"[PDAT]) AND "humans"[MeSH Terms]). Our method for identifying meta-analyses and systemic reviews was based on the Montori method that has been used in other databases \cite{11525102}. The search was limited to English language articles on May 18th and May 26 2015.  
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