The phrase "concern by" is not correct or usable in written English.
The correct phrase would be "concerned by" or "concerning". For example: My family was concerned by my decision to attend college out of state.
The remarks were met with concern by leading social landlords.
The plan also seeks to mitigate traffic, a major concern, by improving roads and traffic signals.
There has been no expression of concern by any member of the board".
One essential element was concern by different agencies that sources of their information be kept secret.
It sidesteps the ethical concern by reframing it as a monetary issue.
"There was concern by the dancers that he was basically stalking them inside the club".
The administration's action follows expressions of deep concern by members of Congress from both parties.
The Jane's report was likely to be viewed with concern by Western officials and Israel.
Russia has often tried to take advantage of their concern, by playing them off against America.
The decision was initially met with skepticism and concern by some league executives.
It was restarted this year as a going concern by its owner, Angel Mining, registered in London.
