The phrase "blank concern" is correct and usable in written English.
You can use it when referring to an unspecified worry or fear. For example, "Her parents had a blank concern about what would become of her after college."
Figure 1 illustrates the way in which we attempted to map the four general areas of the blank Concerns form to the seven categories of professional behaviour detailed in the GMC documentation [ 7].
"Particularly when you're talking about China, but there's other countries where this is true too, one has to be worried about national security concerns," Blank said in remarks at the Council on Foreign Relations earlier on Friday.
Maggie brought considerable experience in handling Shakespeare's verse and honoured the metre and did everything else that I approved of (I began acting at Cambridge, where they were very concerned about blank verse speaking).
He had a blank face that showed no concern about whether his classes were taking in the lesson or not.
What you'll see, behind the love and concern, is a blank sort of terror.
Although Pb levels in the environment have decreased since Pb was removed from gasoline, the processing blank is still a major concern in the design of chemical separation procedures.
Concerned by my blank stare, Shawn shot me questions: Do you know who came over last night?
I'm No Angel I sit here starting at a blank computer screen, filled with quiet concern.
Solitude, barrier reef, star To whatever merits most Concerns born of our blank white chart.
But the fog he left behind has in no way lifted with arrival of Bradley, a bit of a blank slate where media matters are concerned.
