The part of the sentence "study on this subject" is correct and usable in written English.
You can use it whenever you are referring to the researching and examination of a particular topic. For example: "We need to do more study on this subject in order to better understand the implications of the new policy."
Probably due to these expected confounding radiotherapy-induced effects on FDG uptake only one study on this subject has been performed.
Probably due to these expected confounding radiotherapy-induced effects on FDG uptake, only one study on this subject has been performed [61].
Although techniques for suturing of the vaginal cuff have changed rapidly over the past years, only one prospective study on this subject has been published [5].
To the authors' knowledge, only one prospective study on this subject has yet been published, involving 159 patients ≥65 years with type II fractures but focusing just on characteristics associated with treatment success or failure and not on describing fracture healing [ 14].
One study on this subject estimates that there is a one percent decrease in enrollment for every $400 increase in tuition at public institutions.
This is the first study on this subject in Ethiopia and is also one of few research reports on this subject from Africa.
Five studies on this subject have been published since 2011.
Obviously, more in-depth studies on this subject are urgently required.
A recent survey of more than twenty studies on this subject, published in the journal Economics and Human Biology, found that the adoption of agriculture "was observed to decrease stature in populations from across the entire globe," including in Europe, the Middle East, Asia, and South America.
There have also been many academic studies on this subject, illustrating apparent seasonal patterns in stock markets around the world but not fully explaining why they might exist.
Further studies on this subject are desired.
