VITAMIN D DIFICIENCY AND MALE INFERTILITY ACTUAL PROBLEMS OF THE 21ST CENTURY: MALE INFERTILITY, OBESITY AND VITAMIN D - IS THERE A RELATIONSHIP? ArticlePavlova Z.S., Kalinchenko S.Y., Tishova Y.A., Zhuykov A.V., Gusakova D.A.Вестник Уральской медицинской академической науки. 2013. С. 26-32