While imperfect, such animal models can be substituted when human studies raise moral concerns.
But the research is detecting measures of athletic fitness and, as a consequence, the studies raise ethical questions.
But recent studies raise the possibility that a predisposition to suicide is transmitted separately from a vulnerability to mental illness.
The Food and Drug Administration agrees that these studies raise no new safety concerns.
Taken together, many such studies raise the possibility that the chemical could be harmful to infants and children, even though no single study has demonstrated that outright.
Both studies raise a prickly question: is anyone responsible for changing how students learn and solve problems, albeit in an economy that has transformed dramatically in a generation?
These studies raise questions regarding the impacts of release incidents.
Field studies raise as many questions as answers.
The risks of AEDs in humans are less clear, but recent studies raise concerns, especially for valproate.
Net-risk studies raise concern that subjects are being used as mere means to collect information to benefit future patients.
These studies raise difficult questions regarding the possibility of what might be called 'contribution' and 'information' risks.
