1. aEssential Health Technologies Department, World Health Organization, 20 avenue Appia, 1211 Geneva 27, Switzerland.
2. bJohns Hopkins University School of Medicine, Baltimore, United States of America.
3. cWorld Federation of Societies of Anaesthesiologists, London, England.
4. eHuman Resources for Health Department, World Health Organization, Geneva, Switzerland.
5. dHealth Workforce Alliance, World Health Organization, Geneva, Switzerland.