Comparability of randomized controlled versus observational studies: findings from the Toronto observational study of natalizumab in multiple sclerosis
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Krysko, Kristen M.
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Univ Toronto, Fac Med, Toronto, ON, CanadaUniv Toronto, Fac Med, Toronto, ON, Canada
Krysko, Kristen M.
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O'Connor, Paul W.
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Univ Toronto, Fac Med, Toronto, ON, CanadaUniv Toronto, Fac Med, Toronto, ON, Canada