1 Maternal, Newborn, Child and Adolescent Health and Ageing Department, World Health Organization, Geneva, Switzerland. Electronic address: keoghs@who.int.
2 Maternal, Newborn, Child and Adolescent Health and Ageing Department, World Health Organization, Geneva, Switzerland.
3 Division of Data, Analytics, Planning and Monitoring, United Nations Children's Fund, New York, New York.
4 Department of Paediatrics, Centre for Adolescent Health, Murdoch Children's Research Institute, University of Melbourne, Melbourne, Victoria, Australia; Adolescent Health and Wellbeing Program, Telethon Kids Institute, National Centre for Epidemiology and Population Health, Australian National University, Canberra, Australia.
5 UN Major Group for Children and Youth, London, United Kingdom; Imperial College Healthcare NHS Trust, London, United Kingdom.
6 Independent Consultancy, Tannay, Switzerland.
7 Technical Division, United Nations Population Fund, New York, New York.
8 Vanke School of Public Health, Tsinghua University, Beijing, China.