Maybe there are some very valid long-term reasons?
The constant advances of adhesive materials jeoperdize the execution of valid long-term clinical studies, demanding evidence from in vitro studies that simulate the oral conditions [16].
However, valid long-term outcome studies with sufficient patient numbers are lacking [ 10, 11].
With the same refractive index and viscoelastic parameters of the vitreous, as well as good biocompatibility, it seemed to be a valid long-term substitution.
In the context of a real network, the key findings of the article should be valid in long term, i.e., assuming averaging of the traffic load conditions due to user mobility and variation in time.
The results of the validation study indicate that the food frequency questionnaire provides reasonably valid measurements for long term dietary intakes of common foods, macronutrients, and common micronutrients.
Such a strategy is still valid in the long term, but could be problematic in today's uncertain economic climate.
Other projects were directionally valid over the long term; Guyana and Venezuela, for example, produce substantially more gold today than when Operation Goldfinger was eying them in the late nineteen-sixties.
For this reason, it's often unknown why the chemicals never made it to market, which leads to some fairly valid concerns about their long term health effects.
Although 13 days of exposure might not exactly represent the chronic effect of cadmium on the kidney living environment, our experiment suggests that the cell culture system serves as a valid model for studying the long term toxicity of cadmium on the kidney.
The simulation time equates to about 8000 contention cycles, what seems to be sufficient to achieve valid data statistics also about the long term behavior of the protocols.
