Dr Walter Atwood, a virologist based at Brown University who worked on the study, said the drugs may prove to be an effective, ready-made therapy for PML prevention or treatment.

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Bored at home, Marty finds a surrogate father in the town's nutty inventor, Dr. Emmett Brown.

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But Dr. Scott Haltzman, a clinical psychiatrist and an assistant professor at Brown University, says it's important that mothers focus on their children.

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Dr. Brown, for example, believes babies should be off a pacifier by six months or a year due to potential dental or language issues.

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