1 Division of Medical Critical Care, Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA. christina.cifra@childrens.harvard.edu.
2 Department of Pediatrics, University of Iowa Carver College of Medicine, Iowa City, IA, USA. christina.cifra@childrens.harvard.edu.
3 Department of Sociology, University of Iowa College of Liberal Arts and Sciences, Iowa City, IA, USA.