The phrase "are present in approximately" is correct and usable in written English.
It can be used when discussing the occurrence or availability of something within a certain estimate or range.
Example: "The species are present in approximately 30% of the surveyed areas."
Alternatives: "are found in roughly" or "exist in about".
Urethral injuries are present in approximately 20% of patients with penile fractures [8].
Underlying etiologies are present in approximately 40% of the cases and are mostly related to Chiari type I malformation.
Previous series from North America and Europe have demonstrated that systemic autoimmune diseases are present in approximately 30 50% of patients with scleritis [3, 4, 26].
They are present in approximately 12%% of patients with portal hypertension, but are more frequent in those with extrahepatic portal vein obstruction (30%%) [3].
Activating mutations of FMS-like tyrosine kinase 3 (FLT3) are present in approximately one third of acute myeloid leukemia (AML) patients, which has been proposed as a promising drug target for AML therapy.
From photo analysis (Figure 11), it was found that seven to nine individual leopards are present in approximately 150 km2, based on 21 different photographic events and more than 100 photographs.
Fibrofolliculoma of the skin with three characteristic symptoms can be detected only in 20% to 27% of the BHD cases in Japan [4-6], whereas in Europe and the United States, these symptoms are present in approximately 90% of the BHD patients [7-9].
It is important to mention that abnormal high levels of HER2-ERBB2 are present in approximately 18 20% of breast cancers ([43] and references therein).
Antibodies against the Ro autoantigen are present in approximately 50% sera from SLE patients [13], though even less specific, and generally bind a 60 kD Ro protein with many also binding a 52 kD Ro moiety.
In most cell types where the DMPK gene is naturally expressed, isoforms A and C are present in approximately equal amounts [5,8, Mulders and Wansink, data not shown].
Abnormal high levels of ERBB2 are present in approximately 18 20% of breast cancers and gene amplification is the predominant mechanism leading to ERBB2 overexpression which in turn enhance cell proliferation ([43] and references therein).
