Comparing L1-L2 differences in lexical bundles in student and expert writing

Numerous studies have compared the use of lexical bundles between L1 and L2 academic writing or between students and expert writing. However, the results of these studies are mixed due to differences in the control of potentially confounding variables (e.g. discipline, the level of expertise). It is still unclear whether the L1 background, or the level of expertise (i.e. student versus expert) accounts for the differences in the use of lexical...