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. 2021 Jan 4;9:3. doi: 10.1186/s40345-020-00207-z

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Gender distribution in Bipolar Disorder as shown in the main large sample studies of the last ten years. a Graphic representation of gender distribution in 9 main large sample studies, reported as percentage of female and male participants upon the total number of BD patients; b percentages of females and males in BD type-specific samples; c gender distribution of three samples, confronted with the BD type-specific composition of the samples. BDI = Bipolar Disorder type I; BDII Bipolar Disorder type II.