1. Queen's University Belfast; School of Nursing and Midwifery; 97 Lisburn Road Belfast UK BT9 7BL
2. Queen's University Belfast ; Nursing and Midwifery Research Unit; School of Nursing and Midwifery 10 Malone Road Belfast Northern Ireland UK BT9 5BN
3. Sunnybrook Health Sciences Centre; Departments of Medicine and Critical Care Medicine; 2075 Bayview Avenue, Room D478 Toronto Ontario Canada M4N 3M5
4. Royal Bershire Hospital ; Anaesthetics and Intensive Care; London Road Reading UK RG1 5AN
5. University of Ottawa; Institute of Population Health; 1 Stewart Street Ottawa Ontario Canada K1N 6N5