1. Hackensack University Medical Center; Department of Medicine; 30, Prospect Avenue Hackensack NJ USA 07601
2. Cooper Medical School of Rowan University (CMSRU) and UMDNJ/RWJ Medical School, Cooper University Hospital; Department of Medicine; Camden NJ USA 08103
3. Minneapolis Heart Institute at Abbott Northwestern Hospital/Hennepin County Medical Center; Section of Cardiovascular Medicine; 701 Park Ave S Cardiology, O5 Minneapolis MN USA 55415
4. Christiana Care Health System; Department of Medicine; Newark DE USA
5. Cooper University Hospital, CMSRU; Medical Library; Camden NJ USA 08103
6. Aberdeen Royal Infirmary; Department of Anaesthetics; Foresterhill Aberdeen Scotland UK AB25 2ZN
7. John Radcliffe Hospital; Adult Intensive Care Unit; Headley Way Oxford UK OX3 9DU
8. Intensive Care National Audit & Research Centre; Napier House 24 High Holborn London UK WC1V 6AZ