But the current study omitted some factors, some of which might be important to current and future adoptive parents.
But the current study cannot rule out that the Merck drug increases other causes of death, as the Pfizer drug appeared to do.
Registry studies such as the current one enable researchers to use accumulated data on the real-world experience of thousands of patients, but as the current study suggests, that doesn't necessarily resolve uncertainty over which treatment approach is better.
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"There is no easy way out of this, " says Dr. Tim Oberlander, a developmental pediatrician at BC Children's Hospital, in Vancouver, Canada, who has studied the effects of SSRIs on children exposed in the womb, but was not involved in the current study.
"If kids are getting adequate sleep, they're going to have more energy during the day to be physically active, " says Dalton, who has researched the link between families and obesity but was not involved in the current study.
But he cautioned that the current study only showed a link - it does not prove living next to a road definitely affects kidney function.
Whitley is a leading expert on herpes but was not involved in the current study.
"Trying to manage the stress and having social support may reduce the risk of mortality, " says Sareen, who has studied suicide risk and suicidal thoughts among cancer patients, but wasn't involved in the current study.
The latest trial does not provide a comparison to the current "gold standard, " but "researchers are planning to study combinations of the pill and camptosar as well, " said Hoff.
Sigal co-authored an editorial accompanying the new study, but wasn't involved in the current research.
Misono led a similar study on suicide among cancer patients in 2008 but was not involved in the current research.
Labour said it would "study in detail" the report's proposals but said "in the current economic environment" that increased state funding for parties was "not a priority".
But there is growing interest in the study of happiness, not just among geneticists but also among economists and policymakers dissatisfied with current ways of measuring humanity's achievements.
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