The part of a sentence "study has been started" is correct and usable in written English.
It is a passive construction, where the subject receives the action of the verb. This construction is often used to emphasize the action rather than the doer. You can use this construction when you want to focus on the action that has been completed or is currently in progress, rather than the person or thing performing the action. Example: "The project's feasibility study has been started by the research team." This sentence emphasizes that the study has already begun and is currently in progress, rather than specifying who exactly started it.
This study has been started since August 2010 and aims to provide a new evaluation method of (1) passive safety architectures related to internal events and (2) an advanced seismic isolation system related to a seismic event as a representative external event in Japan.
In May 2007 the randomized treatment study has been started up.
131 Nevertheless, since 95% of Niemann Pick patients have a mutation in NPC1, a phase I study has been started with the HDAC inhibitor vorinostat in this patient population (registered at ClinicalTrials.gov with identifier number NCT02124083).
Also the Dutch Obstetrics & Gynaecology Society has promoted ECV but up until now, the implementation of this guideline is rather poor and a recent study has been started to evaluate possible barriers [ 4].
Dr. Sinclair said that this leg of the study had been started at the same time, but that the treated normal mice were taking longer to die and could not be reported with the others.
None but one of the HIV positive patients in the study had been started on antiretroviral treatment during the study and she had no evidence of lactose intolerance.
Many studies have been started for testing the pathogenicity of these indigenous EPN species all over the world (Ozer et al., 1995; Kepenekci, 2002; Hazir et al., 2003; Unlu et al., 2007 and Erbas et al., 2013).
Preclinical and early clinical studies have been started to examine bortezomib's effectiveness in treating other B-cell-related cancers, particularly some types of non-Hodgkin's lymphoma.
Since the German unification in 1990, several large-scale studies have been started.
Recently, various population-based prospective cohort studies have been started worldwide [ 126– 126].
Since then, a number of studies have been started with the aim to determine the mutations that contribute to disease pathogenesis and impact clinical outcomes.
