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Maldarelli F, Kearney M, Palmer S, Stephens R, Mican J, Polis MA, Davey RT, Kovacs J, Shao W, Rock-Kress D, Metcalf JA, Rehm C, Greer SE, Lucey DL, Danley K, Alter H, Mellors JW, Coffin JM. 2013. HIV populations are large and accumulate high genetic diversity in a nonlinear fashion. J Virol 87:10313–10323.