Variants of human papillomaviruses 16 and 18 and their natural history in human immunodeficiency virus-positive women.

Schlecht NF, Burk RD, Palefsky JM, Minkoff H, Xue X, Massad LS, Bacon M, Levine AM, Anastos K, Gange SJ, Watts DH, Da Costa MM, Chen Z, Bang JY, Fazzari M, Hall C, Strickler HD