1. Department of Women’s Anaesthesia, KK Women’s and Children’s Hospital , 100 Bukit Timah Road, Singapore 229899, Singapore
2. Anaesthesiology and Perioperative Sciences Academic Clinical Programme, Duke-NUS Medical School , 8 College Road, Singapore 169857, Singapore
3. Department of Anaesthesia, Singapore General Hospital , Outram Road, Singapore 169608, Singapore
4. Department of Infection Prevention and Epidemiology, Singapore General Hospital , Outram Road, Singapore 169608, Singapore