(this blog post is downloadable both in Word doc and in PDF format). 

Here are mixed bag of psychotherapy-relevant studies.  Foy & colleagues' meta-analysis highlights the value to patients/clients of having good communication between their primary care physician and their mental health professional.  The second paper I mention - free full text - by Mollen et al is a bit of a wake-up call for me.  The authors write " ... we will discuss why people conform to social norms and then extend this knowledge to the field of health communication and behaviour change. We will elaborate on the advantages and disadvantages of using social norm messages, and then offer alternatives for the use of social norms in health communication messages ... Clearly, there is a substantial evidence suggesting that, when unhealthy behaviour is highly prevalent, descriptive norms should not be conveyed in health promotion campaigns.