Looking on the internet deeply has found these results:

concerned that is the most popular phrase on the web.

concerned about him to help 10 results on the web	concerned that 123,200,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Mrs McCarthy is concerned that we are moving very fast. concerned that extreme interrogation techniques have been applied on terror suspects, I'm concerned that you're a bad influence on the Glee Club. Her oncologist was concerned that her tumor may be metastasizing. The Committee is concerned that the proposal does not promote and support wider representation from organised civil society on the Forum. If you're concerned that I'd discuss any perceived shortcomings... She is concerned that her safe deposit box may have been plundered. The Committee is concerned that the proposed Road Safety Action Programme may reinforce this traditional bias.

concerned about him to help

10 results on the web

concerned that

123,200,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Mrs McCarthy is concerned that we are moving very fast.
concerned that extreme interrogation techniques have been applied on terror suspects,
I'm concerned that you're a bad influence on the Glee Club.
Her oncologist was concerned that her tumor may be metastasizing.
The Committee is concerned that the proposal does not promote and support wider representation from organised civil society on the Forum.
If you're concerned that I'd discuss any perceived shortcomings...
She is concerned that her safe deposit box may have been plundered.
The Committee is concerned that the proposed Road Safety Action Programme may reinforce this traditional bias.