1. Department of Anaesthesia ; Kantonsspital Baden; Baden Switzerland
2. Sackler Faculty of Medicine; Tel Aviv University; Tel Aviv Israel
3. Main Library; University of Zurich; Zurich Switzerland
4. Jerusalem College of Technology; Jerusalem Israel
5. Department of Obstetrical Anesthesia; Sunnbrook Health Sciences Centre; Toronto Canada
6. Department of Gynecology; Katonsspital Baden; Baden Switzerland
7. Department of Anaesthesia; Erasmus Medical Center, University of Rotterdam; Rotterdam Netherlands