1 Center for Child Health Research, Faculty of Medicine and Health Technology, Tampere University, Tampere, FIN 33014, Finland. Electronic address: per.ashorn@tuni.fi.
2 Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
3 MARCH Center, London School of Hygiene & Tropical Medicine, London, UK.
4 Center for Child Health Research, Faculty of Medicine and Health Technology, Tampere University, Tampere, FIN 33014, Finland.
5 UCL Great Ormond Street Institute of Child Health, University College London, London, UK.
6 Department of Obstetrics and Gynaecology, University of Botswana, Botswana.
7 Centre of Excellence in Women and Child Health East Africa, Aga Khan University, Nairobi, Kenya.
8 Child Health and Development, Children's Investment Fund Foundation, London, UK.