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Fertility and Sterility|January 10, 2002
Serum sperm antibodies are not elevated after mumps orchitisSvetoslav Kalaydjiev, Dimitrina Dimitrova, Marina Nenova, et al.
Plos One|May 29, 2019
HIV-1 genetic diversity and demographic characteristics in BulgariaErik Billings, Richard A Heipertz, Tonka Varleva, et al.
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