72 A number of studies have examined X (e.g. Smith, 2003; Jones, 2005), but to date none has …. Xs have been identified as major contributing factors for the decline of many species (1). X has also been shown to reverse the anti-inflammatory effects of Y in murine-induced arthritis. Twenty cohort study analyses have examined the relationship between …. At least 152 case-control studies worldwide have examined the relationship between….. Other studies have considered the relationship …. The relationship between X and Y has been widely investigated (Smith, 1985; Jones, 1987, …. The causes of X have been widely investigated (Jones, 1987; Johnson, 1990; Smith, 1994). Factors thought to be influencing X have been explored in several studies. It has been suggested that levels of X are independent of the size of the Y (Smith et al., 1995). It has conclusively been shown that X and Y increase Z (Smith et al., 1999; Jones, 2001 ….). It has been demonstrated that a high intake of X results in damage to …. (Smith, 1998; ….). Reference to current state of knowledge
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