1 Centre for Medical Education, Yong Loo Lin School of Medicine, National University of Singapore, 117597 Singapore. Electronic address: dujeepa@nus.edu.sg.
2 School of Nursing, University of the Free State, Bloemfontein, South Africa.
3 Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas São Paulo, Brazil.
4 University College London Medical School, London, UK.