1 Division of Health Services and Outcomes Research, Children's Mercy Research Institute, Children's Mercy Kansas City, Kansas City, MO 64108, USA; Department of Pediatrics, University of Missouri - Kansas City School of Medicine, Kansas City, MO, USA; Department of Population Health, University of Kansas Medical Center, Kansas City, KS, USA. Electronic address: eahurley@cmh.edu.
2 Institute for Global Health, University College London, London, UK; Department of International Health, Johns Hopkins School of Public Health, Baltimore, MD, USA.
3 Department of International Health, Johns Hopkins School of Public Health, Baltimore, MD, USA.