69 Little is known about X and it is not clear what factors …. This indicates a need to understand the various perceptions of X that exist among …. So far this method has only been applied to …. So far, however, there has been little discussion about …. However, far too little attention has been paid to …. However, the evidence for this relationship is inconclusive …. However, much uncertainty still exists about the relation between …. General descriptions of the relevant literature A large and growing body of literature has investigated …. More recent attention has focused on the provision of …. Much of the current literature on X pays particular attention to …. Over the past decade most research in X has emphasized the use of …. There is a large volume of published studies describing the role of …. In recent years, there has been an increasing amount of literature on …. The generalisability of much published research on this issue is problematic.
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