'indicate a concern' is a correct and usable phrase in written English.
It can be used when you want to show that you are worried about something or that you are questioning something. For example, "The rising unemployment rate in our town indicates a concern for the local economy."
I constantly expect him to shout "hang on", or something that might indicate a concern for my welfare as we round a blind corner.
The presence of egg and gum may indicate a concern for practical matters such as rolling, stretching and storing preprepared canvases.
For both types of micro-time hot spots, these results do not indicate a concern for multicollinearity (Field 2009), so these variables are included in the final analysis for each crime type.
Boghardt comments that "his eagerness to display his honour may indicate a concern that others doubted this very quality in him.
We found only two examples where the interactional environment allowed the patient to utilise this formulation to indicate a concern with their nurse".
Furthermore, perceived insufficient sleep is similar to a sleep complaint measure provided in a primary care setting to indicate a concern or problem with sleep quality and quantity such as sleep disturbance and other symptoms of sleep disorders.
Our findings indicate a concerning pattern of documentation practices in the Danish psychiatric hospitals regarding patients with schizophrenia.
However, Amnesty International has indicated a concern about the time taken for the transition to a new approach.
On the one hand, the term "frigidity" became popular, indicating a concern that women achieve sexual pleasure with their husbands.
Among his first moves will be to visit Glasgow film festival this month, perhaps indicating a concern that Edinburgh is being eclipsed by its increasingly popular rival.
But the energy minister, Charles Hendry, told the Guardian: "We have indicated a concern that [the FIT] is intended for micro-generation.
