1. University of Aberdeen; Institute of Applied Health Sciences, Epidemiology Group, School of Medicine, Medical Sciences and Nutrition; Aberdeen UK
2. NHS Grampian; Department of Anaesthesia; Aberdeen UK
3. University of Split; School of Medicine; Soltanska 2 Split Croatia 21000
4. University of Utah; Department of Anesthesiology; 30 North 1900 East, Room 3C444 Salt Lake City UT USA 84132-2304