1 Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK; College of Health and Medical Sciences, Haramaya University, Haramaya, Ethiopia; KEMRI-Wellcome Trust Research Programme, Kilifi, Kenya. Electronic address: anna.seale@lshtm.ac.uk.
2 Newborn Health Knowledge Centre, WHO Collaborating Centre for Training and Research in Newborn Care, Neonatal Division at the Department of Paediatrics, All India Institute of Medical Sciences, New Delhi, India.