Studies have questioned the long-term health effects of offspring conceived after fertility treatments.
But recent studies have questioned the connection.
But more recent studies have questioned the heart benefits and suggested that the vitamins might interfere with cholesterol-lowering drugs.
In recent years, academic studies have questioned the central premises of Christensen's original "disruptive innovation" theory – that outsiders can produce cheap solutions that can displace existing market leaders.
Other studies have questioned Jensen's null sex difference theory.
Recent studies have questioned the original impactor scenario.
Recently, some studies have questioned the findings of in vitro root-sectioning methodology studies.
Some studies have questioned the picture of a wet and warm early Mars, e.g. Hoffman (2000).
Though gold nanoparticles have been considered bio-inert, recent studies have questioned their safety.
However, recently several studies have questioned the protective role of high plasma HDL levels.
But some recent studies have questioned just how genetically distinct the Basques really are.
