"have been often reported" is a grammatically correct and usable phrase in written English.
It is typically used in a passive voice construction to indicate that something has been reported multiple times in the past, but is still considered relevant or important in the present. Example: The negative effects of pollution on the environment have been often reported, yet many industries continue to disregard regulations.
Pyrazole derivatives have been often reported for their favorable bioactivities.
Ferrimagnetic iron sulfides (i.e. greigite, pyrrhotite) and oxidized titanomagnetite (or titanomaghemite) have been often reported as problematic magnetic carriers.
John Austin Moore described his voyage up the road during the summer of 1951: :"Our first trip by car took us over the famed Chapleau Road, the scenery and unique loneliness of which have been often reported in magazines.
While maternal high-fat diets have been often reported to program obesity in offspring [15] [19], discrepant results obtained in rodents may be related to the choice of the strain, the litter size and the composition of the inappropriate diet promoting maternal obesity, mimicking the features of hypercaloric foods available in modern societies [20], [21].
In particular, previously unappreciated functions have been often reported in recent 10 years.
Hepatomegaly, splenomegaly and nephropathy have been often reported in dogs with canine visceral leishmaniasis [ 22, 23].
-- This case is familiar, having been often reported.
LDT is a very often-used diagnostic to characterize liquid sprays and the 3-parameter Generalized-Gamma function is another form of the well-known Nukiyama–Tanasawa distribution whose competence to reproduce measured data has been often reported.
The modification of cell surface hydrophobicity has been often reported in combination with stress studies on bacteria (Neumann et al. 2006; Baumgarten et al. 2012).
1,2,3,4-tetrahydroquinoline (THQ), widely existing in natural products [9, 10], has been often reported for its favorable bioactivities, such as anticancer [11, 12], antibacterial [13, 14], antifungal [15, 16] activities, and so on.
