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Blanchard R (يناير 2018). "Fraternal Birth Order, Family Size, and Male Homosexuality: Meta-Analysis of Studies Spanning 25 Years". Archives of Sexual Behavior. ج. 47 ع. 1: 1–15. DOI:10.1007/s10508-017-1007-4. PMID:28608293. S2CID:10517373.