The part of the sentence "has been frequently identified" is correct and usable in written English.
You can use it to refer to something that has been recognized or singled out multiple times in the past. For example: "The need for more efficient recycling systems in urban areas has been frequently identified in recent years."
Deregulation of this pathway has been frequently identified in the development of hepatocellular carcinoma (HCC).
Motivation in sport has been frequently identified as a key factor of young athletes' intention of doping in sport, but there has not been any attempt in scrutinizing the motivational mechanism involved.
However, genetic variation within and between populations has been frequently identified for developmental time, suggesting that DT in a particular environment is not necessarily the maximum and that rapid growth rates may have an associated fitness cost.
Yersinia pseudotuberculosis, has been frequently identified in Europe and parts of Asia, and occurs sporadically in the US.
RSV has been frequently identified as the commonest virus and is associated with severe infections [ 25- 28].
Smoking has been frequently identified as a risk factor for influenza; the identified mechanisms are mechanical, structural, and immunity related (30 – 30 ).
Since the first discoveries by Johannes Bureus in the late 16th century, these runestones have been frequently identified by scholars, with many stones discovered during a national search for historic monuments in the late 17th century.
Indeed, HIV-1 recombinants between subtype B and subtype F have been frequently identified since the introduction of subtype F in Brazil [6], [7], [8], [9], [10], [11], [12].
As more mitochondrial genomes are sequenced, mitochondrial duplications and gene rearrangements have been frequently identified among diverse animal groups.
