The problems with some epidemiological studies
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PII: S0378-5122(07)00063-1
doi:10.1016/j.maturitas.2007.02.003
© 2007 Published by Elsevier Inc.
PII: S0378-5122(07)00063-1
doi:10.1016/j.maturitas.2007.02.003
© 2007 Published by Elsevier Inc.