The phrase "especially when concerning" is correct and usable in written English.
You can use it when you want to emphasize something that relates to a particular topic or idea. For example, "Eating a balanced diet is especially important when concerning child nutrition."
Cultural factors at the corporation prevented staff from reporting sexual complaints to senior staff – especially when concerning what Smith calls "the talent", a problem which she suggests still exists today.
After speaking to more than 800 people, Smith concluded: Cultural factors at the corporation prevented staff from reporting sexual complaints to senior staff – especially when concerning what she calls "the talent", a problem which she suggests still exists today.
There is a strong likelihood of bias occurring in a primary source, especially when concerned with major historical events such as wars and revolutions.
We conclude that the range of drugs prescribed is a useful concept that could be used in addition to prescribing volume in research into prescription behaviour, especially when information concerning the indication is lacking.
These compromise bills typically are approved, especially when they concern must-pass legislation.
And they suggest that Japan has its own ideas about solving global problems, especially when they concern its immediate neighborhood, or the lives of its citizens.
But it's an emotionally difficult diagnosis for a pediatrician to contemplate, especially when it concerns a family you feel you know well.
Steve Hynes, director of the Legal Action Group, said: "Politicians can set policy around the justice system but they cannot rule on individual cases, especially when it concerns politicians.
The Japanese right has resented American interference in its domestic politics since the postwar occupation, especially when it concerns interpretations of Japan's wartime past.
Steven M. Gillon, the author of "Boomer Nation: The Largest and Richest Generation Ever and How It Changed America" (Simon & Shuster, 2004), warns against generalizing about baby boomers, especially when it concerns politics.
He's got a knack of spinning great stories out of the most minor incidents, especially when they concern the antics of his eccentric family or the even more peculiar inhabitants of his native Bristol.
