The phrase "and is frequently caused" is correct and usable in written English.
It can be used to describe a situation or condition that often results from a specific cause or factor.
Example: "The increase in pollution levels is concerning, and is frequently caused by industrial emissions."
Alternatives: "and often results from" or "and is often due to".
Hearing loss (HL) is the most common sensorineural disorder worldwide and is frequently caused by a single genetic mutation.
Lissencephaly results from the failure of vertebrate cortical neurons to migrate properly during development, and is frequently caused by mutations in doublecortin (DCX) [55].
Constipation is one of the most common symptoms in palliative care, and is frequently caused by opioids.
Aortic stenosis (AS) is the most usual form of valvular heart disease and is frequently caused by left ventricular outflow tract obstruction in adults [ 129].
In Epidendrum, hybridization appears to be mainly the result of natural causes and is frequently caused by the lack of pollinator specificity and the absence of strong reproductive isolation barriers [ 39].
See related commentary by Meyer et al., http://ccforum.com/content/16/3/128 Severe Traumatic Brain Injury (TBI) mortality and morbidity is frequently caused by the neurological consequences of the brain injury [ 1, 2].
The highest incidence rates of HCC come from Southeast Asia including China and the Republic of Korea, and sub-Saharan Africa, where HCC is frequently caused by HBV infection, and from Japan, where HCC is predominantly caused by HCV [ 3].
Parthenocarpic fruits in B. morelensis are characterized by their development even in the absence of pollination, and abortion of the ovule is frequently caused by an abnormal growth of the ovary walls which ultimately crush the ovule.
A chest X-ray showing cardiomegaly is frequently caused by pericardial effusion and should be further assessed by ultrasound.
Constitutively upregulated transcription factor activity is frequently caused by gene overexpression (Adams and Kaelin, 1996).
Dementia is frequently caused by human immunodeficiency virus (HIV), and miR-21 is often overexpressed in HIV patients.
