1. Department of Women’s Anaesthesia, KK Women’s and Children’s Hospital 229899, Singapore
2. Duke University, Durham, North Carolina 27708, USA
3. Division of Nursing, KK Women’s and Children’s Hospital 229899, Singapore
4. Centre for Quantitative Medicine, Duke-NUS Medical School 169857, Singapore
5. Department of Music Therapy, KK Women’s and Children’s Hospital 229899, Singapore
6. Department of Anesthesiology, Duke University Healthcare System and Durham Veterans Affairs (VA) Healthcare System, Durham, North Carolina 27710, USA
7. Department of Health Policy and Management, University of North Carolina Gillings School of Public Health, Durham, North Carolina 27708, USA