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Shiqiao Tan and Ya Li have the same contributions to this study and should be considered as co-first authors.
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Tan, S., Li, Y. & Li, S. Methodological remarks concerning the recent meta-analysis on vascular endothelial growth factor polymorphism and endometriosis risk. Arch Gynecol Obstet 287, 167–168 (2013). https://doi.org/10.1007/s00404-012-2467-3
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DOI: https://doi.org/10.1007/s00404-012-2467-3