only abstracts
http://onlinelibrary.wiley.com/doi/1...tb09969.x/full
http://linkinghub.elsevier.com/retri...2902986?via=sd
http://informahealthcare.com/doi/abs...f.13.2.119.127
http://onlinelibrary.wiley.com/doi/1...nticated=false

and some more references in here http://www.healthnetworks.health.wa....f_Evidence.pdf