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- [1] Impact on the interpretation of confounding variables of the association of Ureaplasma urealyticum (Uu) colonization and the development of chronic lung disease (CLD) among very-low birth-weight (VLBW) infants. comparison of analyses by patterns of colonization vs Uu+/Un- categories PEDIATRIC RESEARCH, 2000, 47 (04) : 340A - 340A