"There's concern over whether the hunt is sustainable," Perry notes.
Some Americans have expressed concern over whether a chaplain is being political, Stahl said.
But concern over whether that deadline can be met, and to what standard, is causing uncertainty among development organizations.
Now, however, some experts in nuclear weapons design are expressing concern over whether this program is up to the task.
Yet the protesters' celebrations have been tempered by concern over whether the decision will outlast President Obama's tenure in office.
There was some concern over whether they were going to put him on the playoff roster if he didn't apologize.
Within the camp, there is concern over whether the move to Rosario will actually work in their favour.
The presence of these products, designed to modulate human physiology and behaviour, has created concern over whether PhACs similarly affect aquatic organisms.
(AFP 23 But there is still concern over whether the country's security forces will ever be up to the job of managing the more volatile areas of Afghanistan.
But the king's recent medical problems have aroused concern over whether a reformer like him, or a conservative, would succeed him.
About Mr. Kaufmann: Opera circles have been abuzz with concern over whether his illness could be the sign of a vocal problem.
