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HIV-1 genetic diversity and demographic characteristics in BulgariaBillings, Erik; Heipertz, Richard A.; Varleva, Tonka; Sanders-Buell, Eric; O'Sullivan, Anne Marie; Bose, Meera; Howell, Shana; Kijak, Gustavo H.; Taskov, Hristo; Elenkov, Ivailo; Nenova, Marina; Popivanova, Nedialka; Valenzuela, Aimee Bolen; Myles, Otha; Bautista, Christian T.; Robb, Merlin L.; Michael, Nelson L.; Kim, Jerome H.; Scott, Paul T.; Tovanabutra, Sodsai; Ake, Julie A.; Lu, Xinli · PLOS ONE · 2019