Hoymork 2007.

Methods	Study design: randomized parallel groups Study dates: not stated
Participants	Country: Norway and Denmark Sex: female and male Age: NA ASA: I and II Procedure: laparoscopy or breast/surface surgery Study size: 55
Interventions	Quote: "The patients were randomly allocated to whether BIS or CSM was placed on the upper part of the forehead or closer to the eyebrows, where an eventual EMG influence could be more pronounced"
Outcomes	Quote: "None of our patients reported any recall from the operation, and clinical awakening was never observed during surgery, despite one episode of movement"
Notes	Quote: "In conclusion, the cerebral state monitor was a satisfactory alternative to BIS for monitoring hypnotic effect in 87% of our patients. In 13% of the patients, CSI displayed values indicating an awake state despite clinical sleep, all correctly identified with the BIS. Our study was done with the very first version of the CSM, while the BIS monitor has undergone several revisions. Clinical studies in other patient populations, undergoing different anaesthetic regimens, are warranted"